diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index dc559ccd684d442689b9670952f7fc632a7e6833..8b949ffccd8164bc041b98ddf103771580d45a4c 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -4437,23 +4437,20 @@ static int binder_thread_release(struct binder_proc *proc,
 	}
 
 	/*
-	 * If this thread used poll, make sure we remove the waitqueue
-	 * from any epoll data structures holding it with POLLFREE.
-	 * waitqueue_active() is safe to use here because we're holding
-	 * the inner lock.
+	 * If this thread used poll, make sure we remove the waitqueue from any
+	 * poll data structures holding it.
 	 */
-	if ((thread->looper & BINDER_LOOPER_STATE_POLL) &&
-	    waitqueue_active(&thread->wait)) {
-		wake_up_poll(&thread->wait, EPOLLHUP | POLLFREE);
-	}
+	if (thread->looper & BINDER_LOOPER_STATE_POLL)
+		wake_up_pollfree(&thread->wait);
 
 	binder_inner_proc_unlock(thread->proc);
 
 	/*
-	 * This is needed to avoid races between wake_up_poll() above and
-	 * and ep_remove_waitqueue() called for other reasons (eg the epoll file
-	 * descriptor being closed); ep_remove_waitqueue() holds an RCU read
-	 * lock, so we can be sure it's done after calling synchronize_rcu().
+	 * This is needed to avoid races between wake_up_pollfree() above and
+	 * someone else removing the last entry from the queue for other reasons
+	 * (e.g. ep_remove_wait_queue() being called due to an epoll file
+	 * descriptor being closed).  Such other users hold an RCU read lock, so
+	 * we can be sure they're done after we call synchronize_rcu().
 	 */
 	if (thread->looper & BINDER_LOOPER_STATE_POLL)
 		synchronize_rcu();
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index 1abe21758b0d7523a0b66631f615f55e0d07796a..bca0b8980c0e7ef654fabccb0372f7314408ab61 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -855,15 +855,14 @@ extern int vmw_execbuf_fence_commands(struct drm_file *file_priv,
 				      struct vmw_private *dev_priv,
 				      struct vmw_fence_obj **p_fence,
 				      uint32_t *p_handle);
-extern void vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
+extern int vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
 					struct vmw_fpriv *vmw_fp,
 					int ret,
 					struct drm_vmw_fence_rep __user
 					*user_fence_rep,
 					struct vmw_fence_obj *fence,
 					uint32_t fence_handle,
-					int32_t out_fence_fd,
-					struct sync_file *sync_file);
+					int32_t out_fence_fd);
 extern int vmw_validate_single_buffer(struct vmw_private *dev_priv,
 				      struct ttm_buffer_object *bo,
 				      bool interruptible,
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 3834aa71c9c4c90c72f835d9e3db185f73d27e5f..e65554f5a89d509b9c722adf398d2b4e25d44d35 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -3873,20 +3873,19 @@ int vmw_execbuf_fence_commands(struct drm_file *file_priv,
  * object so we wait for it immediately, and then unreference the
  * user-space reference.
  */
-void
+int
 vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
 			    struct vmw_fpriv *vmw_fp,
 			    int ret,
 			    struct drm_vmw_fence_rep __user *user_fence_rep,
 			    struct vmw_fence_obj *fence,
 			    uint32_t fence_handle,
-			    int32_t out_fence_fd,
-			    struct sync_file *sync_file)
+			    int32_t out_fence_fd)
 {
 	struct drm_vmw_fence_rep fence_rep;
 
 	if (user_fence_rep == NULL)
-		return;
+		return 0;
 
 	memset(&fence_rep, 0, sizeof(fence_rep));
 
@@ -3914,20 +3913,14 @@ vmw_execbuf_copy_fence_user(struct vmw_private *dev_priv,
 	 * and unreference the handle.
 	 */
 	if (unlikely(ret != 0) && (fence_rep.error == 0)) {
-		if (sync_file)
-			fput(sync_file->file);
-
-		if (fence_rep.fd != -1) {
-			put_unused_fd(fence_rep.fd);
-			fence_rep.fd = -1;
-		}
-
 		ttm_ref_object_base_unref(vmw_fp->tfile,
 					  fence_handle, TTM_REF_USAGE);
 		DRM_ERROR("Fence copy error. Syncing.\n");
 		(void) vmw_fence_obj_wait(fence, false, false,
 					  VMW_FENCE_WAIT_TIMEOUT);
 	}
+
+	return ret ? -EFAULT : 0;
 }
 
 /**
@@ -4287,16 +4280,23 @@ int vmw_execbuf_process(struct drm_file *file_priv,
 
 			(void) vmw_fence_obj_wait(fence, false, false,
 						  VMW_FENCE_WAIT_TIMEOUT);
+		}
+	}
+
+	ret = vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv), ret,
+				    user_fence_rep, fence, handle, out_fence_fd);
+
+	if (sync_file) {
+		if (ret) {
+			/* usercopy of fence failed, put the file object */
+			fput(sync_file->file);
+			put_unused_fd(out_fence_fd);
 		} else {
 			/* Link the fence with the FD created earlier */
 			fd_install(out_fence_fd, sync_file->file);
 		}
 	}
 
-	vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv), ret,
-				    user_fence_rep, fence, handle,
-				    out_fence_fd, sync_file);
-
 	/* Don't unreference when handing fence out */
 	if (unlikely(out_fence != NULL)) {
 		*out_fence = fence;
@@ -4315,7 +4315,7 @@ int vmw_execbuf_process(struct drm_file *file_priv,
 	 */
 	vmw_resource_list_unreference(sw_context, &resource_list);
 
-	return 0;
+	return ret;
 
 out_unlock_binding:
 	mutex_unlock(&dev_priv->binding_mutex);
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
index 3d546d4093341fd6ba329c06830f173666e2f707..72a75316d472b9f4f58b1a7354d3977a886c2eb9 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c
@@ -1169,7 +1169,7 @@ int vmw_fence_event_ioctl(struct drm_device *dev, void *data,
 	}
 
 	vmw_execbuf_copy_fence_user(dev_priv, vmw_fp, 0, user_fence_rep, fence,
-				    handle, -1, NULL);
+				    handle, -1);
 	vmw_fence_obj_unreference(&fence);
 	return 0;
 out_no_create:
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
index 1554b1d84a6358e942083be5c2db523142cd5563..bf8c721ebfe9ce869f8a7a391af5a9206be3a0aa 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -2663,7 +2663,7 @@ void vmw_kms_helper_buffer_finish(struct vmw_private *dev_priv,
 	if (file_priv)
 		vmw_execbuf_copy_fence_user(dev_priv, vmw_fpriv(file_priv),
 					    ret, user_fence_rep, fence,
-					    handle, -1, NULL);
+					    handle, -1);
 	if (out_fence)
 		*out_fence = fence;
 	else
diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
index a7ac746018ad0c098d51eb56c1d5d8981d34c78c..7a746f41353514a7586626c913d77510452de35e 100644
--- a/drivers/i2c/busses/i2c-xgene-slimpro.c
+++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
@@ -321,6 +321,9 @@ static int slimpro_i2c_blkwr(struct slimpro_i2c_dev *ctx, u32 chip,
 	u32 msg[3];
 	int rc;
 
+	if (writelen > I2C_SMBUS_BLOCK_MAX)
+		return -EINVAL;
+
 	memcpy(ctx->dma_buffer, data, writelen);
 	paddr = dma_map_single(ctx->dev, ctx->dma_buffer, writelen,
 			       DMA_TO_DEVICE);
diff --git a/drivers/media/usb/dvb-usb/az6027.c b/drivers/media/usb/dvb-usb/az6027.c
index 6321b8e302612080d2e93352975198e6a1430ad4..555c8ac44881ece62f92e0a09072a71b8350c2ef 100644
--- a/drivers/media/usb/dvb-usb/az6027.c
+++ b/drivers/media/usb/dvb-usb/az6027.c
@@ -977,6 +977,10 @@ static int az6027_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[], int n
 		if (msg[i].addr == 0x99) {
 			req = 0xBE;
 			index = 0;
+			if (msg[i].len < 1) {
+				i = -EOPNOTSUPP;
+				break;
+			}
 			value = msg[i].buf[0] & 0x00ff;
 			length = 1;
 			az6027_usb_out_op(d, req, value, index, data, length);
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c
index a0670e9cd0127b180a8208880418643ea43680aa..f483211c5cc6623a850960bda78f898e41570bf9 100644
--- a/drivers/mmc/host/moxart-mmc.c
+++ b/drivers/mmc/host/moxart-mmc.c
@@ -695,12 +695,12 @@ static int moxart_remove(struct platform_device *pdev)
 		if (!IS_ERR(host->dma_chan_rx))
 			dma_release_channel(host->dma_chan_rx);
 		mmc_remove_host(mmc);
-		mmc_free_host(mmc);
 
 		writel(0, host->base + REG_INTERRUPT_MASK);
 		writel(0, host->base + REG_POWER_CONTROL);
 		writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF,
 		       host->base + REG_CLOCK_CONTROL);
+		mmc_free_host(mmc);
 	}
 	return 0;
 }
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
index 096ec18e8f15a63ad696d433ab8d9274c96e5688..49c80bac9ce2866ab6307158ca318420e66f9f0e 100644
--- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
+++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c
@@ -459,6 +459,11 @@ int hw_atl_utils_fw_rpc_wait(struct aq_hw_s *self,
 			goto err_exit;
 
 		if (fw.len == 0xFFFFU) {
+			if (sw.len > sizeof(self->rpc)) {
+				printk(KERN_INFO "Invalid sw len: %x\n", sw.len);
+				err = -EINVAL;
+				goto err_exit;
+			}
 			err = hw_atl_utils_fw_rpc_call(self, sw.len);
 			if (err < 0)
 				goto err_exit;
@@ -469,6 +474,11 @@ int hw_atl_utils_fw_rpc_wait(struct aq_hw_s *self,
 
 	if (rpc) {
 		if (fw.len) {
+			if (fw.len > sizeof(self->rpc)) {
+				printk(KERN_INFO "Invalid fw len: %x\n", fw.len);
+				err = -EINVAL;
+				goto err_exit;
+			}
 			err =
 			hw_atl_utils_fw_downld_dwords(self,
 						      self->rpc_addr,
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index fdab498725878d8cca254960f601c2d74e87d63b..3db86f247bf456de033195b4218773a2720a28a1 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -966,9 +966,7 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 				 sizeof(struct yamdrv_ioctl_mcs));
 		if (IS_ERR(ym))
 			return PTR_ERR(ym);
-		if (ym->cmd != SIOCYAMSMCS)
-			return -EINVAL;
-		if (ym->bitrate > YAM_MAXBITRATE) {
+		if (ym->cmd != SIOCYAMSMCS || ym->bitrate > YAM_MAXBITRATE) {
 			kfree(ym);
 			return -EINVAL;
 		}
diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index 81444208b2162126d515dc0948db09e936079a3f..12f100392ed1159d53fd7ed308465e9f33191708 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -493,6 +493,7 @@ nsim_bpf_map_alloc(struct netdevsim *ns, struct bpf_offloaded_map *offmap)
 				goto err_free;
 			key = nmap->entry[i].key;
 			*key = i;
+			memset(nmap->entry[i].value, 0, offmap->map.value_size);
 		}
 	}
 
diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c
index 2a8d40ce463d550e8a11457d7f07c0dabef687e9..e7ba3f3530060cd7989f754436fe8050cc603d3b 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.c
+++ b/drivers/net/wireless/marvell/mwifiex/usb.c
@@ -130,7 +130,8 @@ static int mwifiex_usb_recv(struct mwifiex_adapter *adapter,
 		default:
 			mwifiex_dbg(adapter, ERROR,
 				    "unknown recv_type %#x\n", recv_type);
-			return -1;
+			ret = -1;
+			goto exit_restore_skb;
 		}
 		break;
 	case MWIFIEX_USB_EP_DATA:
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index dc43fa96c3de7883a63a4ce61de21c100ef22f2e..62df09f7cee656018cd9c7e6120c95d1b1ba7d74 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -37,6 +37,8 @@ struct xencons_info {
 	struct xenbus_device *xbdev;
 	struct xencons_interface *intf;
 	unsigned int evtchn;
+	XENCONS_RING_IDX out_cons;
+	unsigned int out_cons_same;
 	struct hvc_struct *hvc;
 	int irq;
 	int vtermno;
@@ -131,6 +133,8 @@ static int domU_read_console(uint32_t vtermno, char *buf, int len)
 	XENCONS_RING_IDX cons, prod;
 	int recv = 0;
 	struct xencons_info *xencons = vtermno_to_xencons(vtermno);
+	unsigned int eoiflag = 0;
+
 	if (xencons == NULL)
 		return -EINVAL;
 	intf = xencons->intf;
@@ -146,7 +150,27 @@ static int domU_read_console(uint32_t vtermno, char *buf, int len)
 	mb();			/* read ring before consuming */
 	intf->in_cons = cons;
 
-	notify_daemon(xencons);
+	/*
+	 * When to mark interrupt having been spurious:
+	 * - there was no new data to be read, and
+	 * - the backend did not consume some output bytes, and
+	 * - the previous round with no read data didn't see consumed bytes
+	 *   (we might have a race with an interrupt being in flight while
+	 *   updating xencons->out_cons, so account for that by allowing one
+	 *   round without any visible reason)
+	 */
+	if (intf->out_cons != xencons->out_cons) {
+		xencons->out_cons = intf->out_cons;
+		xencons->out_cons_same = 0;
+	}
+	if (recv) {
+		notify_daemon(xencons);
+	} else if (xencons->out_cons_same++ > 1) {
+		eoiflag = XEN_EOI_FLAG_SPURIOUS;
+	}
+
+	xen_irq_lateeoi(xencons->irq, eoiflag);
+
 	return recv;
 }
 
@@ -375,7 +399,7 @@ static int xencons_connect_backend(struct xenbus_device *dev,
 	if (ret)
 		return ret;
 	info->evtchn = evtchn;
-	irq = bind_evtchn_to_irq(evtchn);
+	irq = bind_interdomain_evtchn_to_irq_lateeoi(dev->otherend_id, evtchn);
 	if (irq < 0)
 		return irq;
 	info->irq = irq;
@@ -539,7 +563,7 @@ static int __init xen_hvc_init(void)
 			return r;
 
 		info = vtermno_to_xencons(HVC_COOKIE);
-		info->irq = bind_evtchn_to_irq(info->evtchn);
+		info->irq = bind_evtchn_to_irq_lateeoi(info->evtchn);
 	}
 	if (info->irq < 0)
 		info->irq = 0; /* NO_IRQ */
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 139b66565ed6ec3a918b3fedb1c5a9c77e20c1dc..e64756b9b3ccb401b0a4dc34559d36ee2a398ff8 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1624,6 +1624,18 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 	struct usb_function		*f = NULL;
 	u8				endp;
 
+	if (w_length > USB_COMP_EP0_BUFSIZ) {
+		if (ctrl->bRequestType == USB_DIR_OUT) {
+			goto done;
+		} else {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
+			w_length = USB_COMP_EP0_BUFSIZ;
+		}
+	}
+
 	/* partial re-init of the response message; the function or the
 	 * gadget might need to intercept e.g. a control-OUT completion
 	 * when we delegate to it.
@@ -2140,7 +2152,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite,
 	if (!cdev->req)
 		return -ENOMEM;
 
-	cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
+	cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
 	if (!cdev->req->buf)
 		goto fail;
 
diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 04c142c1307592c3826545f299325f2c393f5a7b..ab827c1badc505cd207e19ce8c2e72cc1e3c87b7 100644
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -637,14 +637,17 @@ static int rndis_set_response(struct rndis_params *params,
 	rndis_set_cmplt_type *resp;
 	rndis_resp_t *r;
 
+	BufLength = le32_to_cpu(buf->InformationBufferLength);
+	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
+	if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||
+	    (BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))
+		    return -EINVAL;
+
 	r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
 	if (!r)
 		return -ENOMEM;
 	resp = (rndis_set_cmplt_type *)r->buf;
 
-	BufLength = le32_to_cpu(buf->InformationBufferLength);
-	BufOffset = le32_to_cpu(buf->InformationBufferOffset);
-
 #ifdef	VERBOSE_DEBUG
 	pr_debug("%s: Length: %d\n", __func__, BufLength);
 	pr_debug("%s: Offset: %d\n", __func__, BufOffset);
diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c
index e1d566c9918ae576d55fc322f317d2992193b7f1..355bc7dab9d5f623fbef3b92dd2530d2dc47e443 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -137,7 +137,7 @@ static int dbgp_enable_ep_req(struct usb_ep *ep)
 		goto fail_1;
 	}
 
-	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
+	req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
 	if (!req->buf) {
 		err = -ENOMEM;
 		stp = 2;
@@ -345,6 +345,19 @@ static int dbgp_setup(struct usb_gadget *gadget,
 	void *data = NULL;
 	u16 len = 0;
 
+	if (length > DBGP_REQ_LEN) {
+		if (ctrl->bRequestType == USB_DIR_OUT) {
+			return err;
+		} else {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(DBGP_REQ_LEN);
+			length = DBGP_REQ_LEN;
+		}
+	}
+
+
 	if (request == USB_REQ_GET_DESCRIPTOR) {
 		switch (value>>8) {
 		case USB_DT_DEVICE:
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index f2818195ccf39117fd449366c3a0e5e4c11a3cdf..9d32fa5d66b427dba642e72318d1d7246e2661a6 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -109,6 +109,8 @@ enum ep0_state {
 /* enough for the whole queue: most events invalidate others */
 #define	N_EVENT			5
 
+#define RBUF_SIZE		256
+
 struct dev_data {
 	spinlock_t			lock;
 	refcount_t			count;
@@ -143,7 +145,7 @@ struct dev_data {
 	struct dentry			*dentry;
 
 	/* except this scratch i/o buffer for ep0 */
-	u8				rbuf [256];
+	u8				rbuf[RBUF_SIZE];
 };
 
 static inline void get_dev (struct dev_data *data)
@@ -1333,6 +1335,18 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 	u16				w_value = le16_to_cpu(ctrl->wValue);
 	u16				w_length = le16_to_cpu(ctrl->wLength);
 
+	if (w_length > RBUF_SIZE) {
+		if (ctrl->bRequestType == USB_DIR_OUT) {
+			return value;
+		} else {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(RBUF_SIZE);
+			w_length = RBUF_SIZE;
+		}
+	}
+
 	spin_lock (&dev->lock);
 	dev->setup_abort = 0;
 	if (dev->state == STATE_DEV_UNCONNECTED) {
diff --git a/fs/aio.c b/fs/aio.c
index 413ec289bfa141b2716efe970d9e6d75a38345cf..9635c29b83da178db894d669753b2f875e48f420 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -176,8 +176,9 @@ struct poll_iocb {
 	struct file		*file;
 	struct wait_queue_head	*head;
 	__poll_t		events;
-	bool			done;
 	bool			cancelled;
+	bool			work_scheduled;
+	bool			work_need_resched;
 	struct wait_queue_entry	wait;
 	struct work_struct	work;
 };
@@ -1616,6 +1617,51 @@ static void aio_poll_put_work(struct work_struct *work)
 	iocb_put(iocb);
 }
 
+/*
+ * Safely lock the waitqueue which the request is on, synchronizing with the
+ * case where the ->poll() provider decides to free its waitqueue early.
+ *
+ * Returns true on success, meaning that req->head->lock was locked, req->wait
+ * is on req->head, and an RCU read lock was taken.  Returns false if the
+ * request was already removed from its waitqueue (which might no longer exist).
+ */
+static bool poll_iocb_lock_wq(struct poll_iocb *req)
+{
+	wait_queue_head_t *head;
+
+	/*
+	 * While we hold the waitqueue lock and the waitqueue is nonempty,
+	 * wake_up_pollfree() will wait for us.  However, taking the waitqueue
+	 * lock in the first place can race with the waitqueue being freed.
+	 *
+	 * We solve this as eventpoll does: by taking advantage of the fact that
+	 * all users of wake_up_pollfree() will RCU-delay the actual free.  If
+	 * we enter rcu_read_lock() and see that the pointer to the queue is
+	 * non-NULL, we can then lock it without the memory being freed out from
+	 * under us, then check whether the request is still on the queue.
+	 *
+	 * Keep holding rcu_read_lock() as long as we hold the queue lock, in
+	 * case the caller deletes the entry from the queue, leaving it empty.
+	 * In that case, only RCU prevents the queue memory from being freed.
+	 */
+	rcu_read_lock();
+	head = smp_load_acquire(&req->head);
+	if (head) {
+		spin_lock(&head->lock);
+		if (!list_empty(&req->wait.entry))
+			return true;
+		spin_unlock(&head->lock);
+	}
+	rcu_read_unlock();
+	return false;
+}
+
+static void poll_iocb_unlock_wq(struct poll_iocb *req)
+{
+	spin_unlock(&req->head->lock);
+	rcu_read_unlock();
+}
+
 static void aio_poll_complete_work(struct work_struct *work)
 {
 	struct poll_iocb *req = container_of(work, struct poll_iocb, work);
@@ -1635,14 +1681,27 @@ static void aio_poll_complete_work(struct work_struct *work)
 	 * avoid further branches in the fast path.
 	 */
 	spin_lock_irq(&ctx->ctx_lock);
-	if (!mask && !READ_ONCE(req->cancelled)) {
-		add_wait_queue(req->head, &req->wait);
-		spin_unlock_irq(&ctx->ctx_lock);
-		return;
-	}
+	if (poll_iocb_lock_wq(req)) {
+		if (!mask && !READ_ONCE(req->cancelled)) {
+			/*
+			 * The request isn't actually ready to be completed yet.
+			 * Reschedule completion if another wakeup came in.
+			 */
+			if (req->work_need_resched) {
+				schedule_work(&req->work);
+				req->work_need_resched = false;
+			} else {
+				req->work_scheduled = false;
+			}
+			poll_iocb_unlock_wq(req);
+			spin_unlock_irq(&ctx->ctx_lock);
+			return;
+		}
+		list_del_init(&req->wait.entry);
+		poll_iocb_unlock_wq(req);
+	} /* else, POLLFREE has freed the waitqueue, so we must complete */
 	list_del_init(&iocb->ki_list);
 	iocb->ki_res.res = mangle_poll(mask);
-	req->done = true;
 	spin_unlock_irq(&ctx->ctx_lock);
 
 	iocb_put(iocb);
@@ -1654,13 +1713,14 @@ static int aio_poll_cancel(struct kiocb *iocb)
 	struct aio_kiocb *aiocb = container_of(iocb, struct aio_kiocb, rw);
 	struct poll_iocb *req = &aiocb->poll;
 
-	spin_lock(&req->head->lock);
-	WRITE_ONCE(req->cancelled, true);
-	if (!list_empty(&req->wait.entry)) {
-		list_del_init(&req->wait.entry);
-		schedule_work(&aiocb->poll.work);
-	}
-	spin_unlock(&req->head->lock);
+	if (poll_iocb_lock_wq(req)) {
+		WRITE_ONCE(req->cancelled, true);
+		if (!req->work_scheduled) {
+			schedule_work(&aiocb->poll.work);
+			req->work_scheduled = true;
+		}
+		poll_iocb_unlock_wq(req);
+	} /* else, the request was force-cancelled by POLLFREE already */
 
 	return 0;
 }
@@ -1677,20 +1737,26 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 	if (mask && !(mask & req->events))
 		return 0;
 
-	list_del_init(&req->wait.entry);
-
-	if (mask && spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) {
+	/*
+	 * Complete the request inline if possible.  This requires that three
+	 * conditions be met:
+	 *   1. An event mask must have been passed.  If a plain wakeup was done
+	 *	instead, then mask == 0 and we have to call vfs_poll() to get
+	 *	the events, so inline completion isn't possible.
+	 *   2. The completion work must not have already been scheduled.
+	 *   3. ctx_lock must not be busy.  We have to use trylock because we
+	 *	already hold the waitqueue lock, so this inverts the normal
+	 *	locking order.  Use irqsave/irqrestore because not all
+	 *	filesystems (e.g. fuse) call this function with IRQs disabled,
+	 *	yet IRQs have to be disabled before ctx_lock is obtained.
+	 */
+	if (mask && !req->work_scheduled &&
+	    spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) {
 		struct kioctx *ctx = iocb->ki_ctx;
 
-		/*
-		 * Try to complete the iocb inline if we can. Use
-		 * irqsave/irqrestore because not all filesystems (e.g. fuse)
-		 * call this function with IRQs disabled and because IRQs
-		 * have to be disabled before ctx_lock is obtained.
-		 */
+		list_del_init(&req->wait.entry);
 		list_del(&iocb->ki_list);
 		iocb->ki_res.res = mangle_poll(mask);
-		req->done = true;
 		if (iocb->ki_eventfd && eventfd_signal_count()) {
 			iocb = NULL;
 			INIT_WORK(&req->work, aio_poll_put_work);
@@ -1700,7 +1766,43 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 		if (iocb)
 			iocb_put(iocb);
 	} else {
-		schedule_work(&req->work);
+		/*
+		 * Schedule the completion work if needed.  If it was already
+		 * scheduled, record that another wakeup came in.
+		 *
+		 * Don't remove the request from the waitqueue here, as it might
+		 * not actually be complete yet (we won't know until vfs_poll()
+		 * is called), and we must not miss any wakeups.  POLLFREE is an
+		 * exception to this; see below.
+		 */
+		if (req->work_scheduled) {
+			req->work_need_resched = true;
+		} else {
+			schedule_work(&req->work);
+			req->work_scheduled = true;
+		}
+
+		/*
+		 * If the waitqueue is being freed early but we can't complete
+		 * the request inline, we have to tear down the request as best
+		 * we can.  That means immediately removing the request from its
+		 * waitqueue and preventing all further accesses to the
+		 * waitqueue via the request.  We also need to schedule the
+		 * completion work (done above).  Also mark the request as
+		 * cancelled, to potentially skip an unneeded call to ->poll().
+		 */
+		if (mask & POLLFREE) {
+			WRITE_ONCE(req->cancelled, true);
+			list_del_init(&req->wait.entry);
+
+			/*
+			 * Careful: this *must* be the last step, since as soon
+			 * as req->head is NULL'ed out, the request can be
+			 * completed and freed, since aio_poll_complete_work()
+			 * will no longer need to take the waitqueue lock.
+			 */
+			smp_store_release(&req->head, NULL);
+		}
 	}
 	return 1;
 }
@@ -1708,6 +1810,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 struct aio_poll_table {
 	struct poll_table_struct	pt;
 	struct aio_kiocb		*iocb;
+	bool				queued;
 	int				error;
 };
 
@@ -1718,11 +1821,12 @@ aio_poll_queue_proc(struct file *file, struct wait_queue_head *head,
 	struct aio_poll_table *pt = container_of(p, struct aio_poll_table, pt);
 
 	/* multiple wait queues per file are not supported */
-	if (unlikely(pt->iocb->poll.head)) {
+	if (unlikely(pt->queued)) {
 		pt->error = -EINVAL;
 		return;
 	}
 
+	pt->queued = true;
 	pt->error = 0;
 	pt->iocb->poll.head = head;
 	add_wait_queue(head, &pt->iocb->poll.wait);
@@ -1747,12 +1851,14 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
 	req->events = demangle_poll(iocb->aio_buf) | EPOLLERR | EPOLLHUP;
 
 	req->head = NULL;
-	req->done = false;
 	req->cancelled = false;
+	req->work_scheduled = false;
+	req->work_need_resched = false;
 
 	apt.pt._qproc = aio_poll_queue_proc;
 	apt.pt._key = req->events;
 	apt.iocb = aiocb;
+	apt.queued = false;
 	apt.error = -EINVAL; /* same as no support for IOCB_CMD_POLL */
 
 	/* initialized the list so that we can do list_empty checks */
@@ -1761,23 +1867,35 @@ static ssize_t aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
 
 	mask = vfs_poll(req->file, &apt.pt) & req->events;
 	spin_lock_irq(&ctx->ctx_lock);
-	if (likely(req->head)) {
-		spin_lock(&req->head->lock);
-		if (unlikely(list_empty(&req->wait.entry))) {
-			if (apt.error)
+	if (likely(apt.queued)) {
+		bool on_queue = poll_iocb_lock_wq(req);
+
+		if (!on_queue || req->work_scheduled) {
+			/*
+			 * aio_poll_wake() already either scheduled the async
+			 * completion work, or completed the request inline.
+			 */
+			if (apt.error) /* unsupported case: multiple queues */
 				cancel = true;
 			apt.error = 0;
 			mask = 0;
 		}
 		if (mask || apt.error) {
+			/* Steal to complete synchronously. */
 			list_del_init(&req->wait.entry);
 		} else if (cancel) {
+			/* Cancel if possible (may be too late though). */
 			WRITE_ONCE(req->cancelled, true);
-		} else if (!req->done) { /* actually waiting for an event */
+		} else if (on_queue) {
+			/*
+			 * Actually waiting for an event, so add the request to
+			 * active_reqs so that it can be cancelled if needed.
+			 */
 			list_add_tail(&aiocb->ki_list, &ctx->active_reqs);
 			aiocb->ki_cancel = aio_poll_cancel;
 		}
-		spin_unlock(&req->head->lock);
+		if (on_queue)
+			poll_iocb_unlock_wq(req);
 	}
 	if (mask) { /* no async, we'd stolen it */
 		aiocb->ki_res.res = mangle_poll(mask);
diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c
index 201e9da1692a4bf8c5c88892987334b9af2f879d..64352d2833e2e13d59a5bf993193496448b95d5a 100644
--- a/fs/f2fs/xattr.c
+++ b/fs/f2fs/xattr.c
@@ -658,8 +658,15 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 	}
 
 	last = here;
-	while (!IS_XATTR_LAST_ENTRY(last))
+	while (!IS_XATTR_LAST_ENTRY(last)) {
+		if ((void *)(last) + sizeof(__u32) > last_base_addr ||
+			(void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
+			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
+			error = -EFSCORRUPTED;
+			goto exit;
+		}
 		last = XATTR_NEXT_ENTRY(last);
+	}
 
 	newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
 
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 733fd9e4f0a15cc428b6a48bdca92e6f7fa4810c..f8d805c8046403acb50cfb7ca45b72ab66b259d4 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -1626,6 +1626,19 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 
 no_open:
 	res = nfs_lookup(dir, dentry, lookup_flags);
+	if (!res) {
+		inode = d_inode(dentry);
+		if ((lookup_flags & LOOKUP_DIRECTORY) && inode &&
+		    !S_ISDIR(inode->i_mode))
+			res = ERR_PTR(-ENOTDIR);
+	} else if (!IS_ERR(res)) {
+		inode = d_inode(res);
+		if ((lookup_flags & LOOKUP_DIRECTORY) && inode &&
+		    !S_ISDIR(inode->i_mode)) {
+			dput(res);
+			res = ERR_PTR(-ENOTDIR);
+		}
+	}
 	if (switched) {
 		d_lookup_done(dentry);
 		if (!res)
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 800bcad67325c69e008712b9ccdee4a383381478..5a560b6318c4b55827a2867de9bf5be09cd5c58c 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -1164,9 +1164,13 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 				goto out_dput;
 		}
 	} else {
-		if (!d_is_negative(newdentry) &&
-		    (!new_opaque || !ovl_is_whiteout(newdentry)))
-			goto out_dput;
+		if (!d_is_negative(newdentry)) {
+			if (!new_opaque || !ovl_is_whiteout(newdentry))
+				goto out_dput;
+		} else {
+			if (flags & RENAME_EXCHANGE)
+				goto out_dput;
+		}
 	}
 
 	if (olddentry == trap)
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 3c40a3bf772ce217f3a3ff6af9ae397b24327501..94e0ae01db5c8b0632321f69f875c9e05420b0f4 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -35,17 +35,7 @@
 
 void signalfd_cleanup(struct sighand_struct *sighand)
 {
-	wait_queue_head_t *wqh = &sighand->signalfd_wqh;
-	/*
-	 * The lockless check can race with remove_wait_queue() in progress,
-	 * but in this case its caller should run under rcu_read_lock() and
-	 * sighand_cachep is SLAB_TYPESAFE_BY_RCU, we can safely return.
-	 */
-	if (likely(!waitqueue_active(wqh)))
-		return;
-
-	/* wait_queue_entry_t->func(POLLFREE) should do remove_wait_queue() */
-	wake_up_poll(wqh, EPOLLHUP | POLLFREE);
+	wake_up_pollfree(&sighand->signalfd_wqh);
 }
 
 struct signalfd_ctx {
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 4fcd2126605ae671a0cb01c18c6036d6664306a7..af53e2fd1b155d0f6221db48bc1d63cb88db9da6 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -251,10 +251,6 @@ int udf_expand_file_adinicb(struct inode *inode)
 	char *kaddr;
 	struct udf_inode_info *iinfo = UDF_I(inode);
 	int err;
-	struct writeback_control udf_wbc = {
-		.sync_mode = WB_SYNC_NONE,
-		.nr_to_write = 1,
-	};
 
 	WARN_ON_ONCE(!inode_is_locked(inode));
 	if (!iinfo->i_lenAlloc) {
@@ -298,8 +294,10 @@ int udf_expand_file_adinicb(struct inode *inode)
 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
 	/* from now on we have normal address_space methods */
 	inode->i_data.a_ops = &udf_aops;
+	set_page_dirty(page);
+	unlock_page(page);
 	up_write(&iinfo->i_data_sem);
-	err = inode->i_data.a_ops->writepage(page, &udf_wbc);
+	err = filemap_fdatawrite(inode->i_mapping);
 	if (err) {
 		/* Restore everything back so that we don't lose data... */
 		lock_page(page);
@@ -311,6 +309,7 @@ int udf_expand_file_adinicb(struct inode *inode)
 		unlock_page(page);
 		iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
 		inode->i_data.a_ops = &udf_adinicb_aops;
+		iinfo->i_lenAlloc = inode->i_size;
 		up_write(&iinfo->i_data_sem);
 	}
 	put_page(page);
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 6ffb53edf1b4a1b5eea3cedb33e61561348c4e5d..f123089816089b436a2c3af26d038988789b7ce9 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -701,7 +701,8 @@ xfs_ioc_space(
 		flags |= XFS_PREALLOC_CLEAR;
 		if (bf->l_start > XFS_ISIZE(ip)) {
 			error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
-					bf->l_start - XFS_ISIZE(ip), 0);
+					bf->l_start - XFS_ISIZE(ip),
+					XFS_BMAPI_PREALLOC);
 			if (error)
 				goto out_unlock;
 		}
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 5225832bd6ff11415422470c5c25e60c1dad6821..bb9cb84114c151059ccac74ca07a113ea22c347a 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -6,6 +6,7 @@
 #include <linux/mutex.h>
 #include <linux/netdevice.h>
 #include <linux/wait.h>
+#include <linux/refcount.h>
 #include <uapi/linux/rtnetlink.h>
 
 extern int rtnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, u32 group, int echo);
@@ -34,6 +35,7 @@ extern void rtnl_unlock(void);
 extern int rtnl_trylock(void);
 extern int rtnl_is_locked(void);
 extern int rtnl_lock_killable(void);
+extern bool refcount_dec_and_rtnl_lock(refcount_t *r);
 
 extern wait_queue_head_t netdev_unregistering_wq;
 extern struct rw_semaphore pernet_ops_rwsem;
@@ -83,6 +85,11 @@ static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev)
 	return rtnl_dereference(dev->ingress_queue);
 }
 
+static inline struct netdev_queue *dev_ingress_queue_rcu(struct net_device *dev)
+{
+	return rcu_dereference(dev->ingress_queue);
+}
+
 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev);
 
 #ifdef CONFIG_NET_INGRESS
diff --git a/include/linux/wait.h b/include/linux/wait.h
index ed7c122cb31f407f70a36a198d5e6d9ae48c01fa..1d726d79063c573b9c13a8b83aea8113d490f2ab 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -191,6 +191,7 @@ void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
 void __wake_up_sync_key(struct wait_queue_head *wq_head, unsigned int mode, int nr, void *key);
 void __wake_up_locked(struct wait_queue_head *wq_head, unsigned int mode, int nr);
 void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr);
+void __wake_up_pollfree(struct wait_queue_head *wq_head);
 
 #define wake_up(x)			__wake_up(x, TASK_NORMAL, 1, NULL)
 #define wake_up_nr(x, nr)		__wake_up(x, TASK_NORMAL, nr, NULL)
@@ -217,6 +218,31 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr);
 #define wake_up_interruptible_sync_poll(x, m)					\
 	__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, poll_to_key(m))
 
+/**
+ * wake_up_pollfree - signal that a polled waitqueue is going away
+ * @wq_head: the wait queue head
+ *
+ * In the very rare cases where a ->poll() implementation uses a waitqueue whose
+ * lifetime is tied to a task rather than to the 'struct file' being polled,
+ * this function must be called before the waitqueue is freed so that
+ * non-blocking polls (e.g. epoll) are notified that the queue is going away.
+ *
+ * The caller must also RCU-delay the freeing of the wait_queue_head, e.g. via
+ * an explicit synchronize_rcu() or call_rcu(), or via SLAB_TYPESAFE_BY_RCU.
+ */
+static inline void wake_up_pollfree(struct wait_queue_head *wq_head)
+{
+	/*
+	 * For performance reasons, we don't always take the queue lock here.
+	 * Therefore, we might race with someone removing the last entry from
+	 * the queue, and proceed while they still hold the queue lock.
+	 * However, rcu_read_lock() is required to be held in such cases, so we
+	 * can safely proceed with an RCU-delayed free.
+	 */
+	if (waitqueue_active(wq_head))
+		__wake_up_pollfree(wq_head);
+}
+
 #define ___wait_cond_timeout(condition)						\
 ({										\
 	bool __cond = (condition);						\
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 93253ba1eeac3df071a130de2f75fa28d48db7ba..78f5f0426e6b6d5bd7208a8de21d8ae1b190285b 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -471,6 +471,7 @@ struct nft_set_binding {
 };
 
 enum nft_trans_phase;
+void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set);
 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
 			      struct nft_set_binding *binding,
 			      enum nft_trans_phase phase);
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 5e99771a5dcc2ed56b7a9c8f3f0447646a8d3b36..670ee4fc0c34b857a6c780819bd559ac4a6ba867 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -102,6 +102,7 @@ int qdisc_set_default(const char *id);
 void qdisc_hash_add(struct Qdisc *q, bool invisible);
 void qdisc_hash_del(struct Qdisc *q);
 struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
+struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle);
 struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
 					struct nlattr *tab,
 					struct netlink_ext_ack *extack);
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index d737a6a2600be802672bdcd119a782aad1a5ec9d..e172e9ebe64359c96238720f571a87102ade2fcb 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -108,6 +108,7 @@ struct Qdisc {
 
 	spinlock_t		busylock ____cacheline_aligned_in_smp;
 	spinlock_t		seqlock;
+	struct rcu_head		rcu;
 };
 
 static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
@@ -117,6 +118,19 @@ static inline void qdisc_refcount_inc(struct Qdisc *qdisc)
 	refcount_inc(&qdisc->refcnt);
 }
 
+/* Intended to be used by unlocked users, when concurrent qdisc release is
+ * possible.
+ */
+
+static inline struct Qdisc *qdisc_refcount_inc_nz(struct Qdisc *qdisc)
+{
+	if (qdisc->flags & TCQ_F_BUILTIN)
+		return qdisc;
+	if (refcount_inc_not_zero(&qdisc->refcnt))
+		return qdisc;
+	return NULL;
+}
+
 static inline bool qdisc_is_running(struct Qdisc *qdisc)
 {
 	if (qdisc->flags & TCQ_F_NOLOCK)
@@ -555,7 +569,8 @@ void dev_deactivate_many(struct list_head *head);
 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
 			      struct Qdisc *qdisc);
 void qdisc_reset(struct Qdisc *qdisc);
-void qdisc_destroy(struct Qdisc *qdisc);
+void qdisc_put(struct Qdisc *qdisc);
+void qdisc_put_unlocked(struct Qdisc *qdisc);
 void qdisc_tree_reduce_backlog(struct Qdisc *qdisc, unsigned int n,
 			       unsigned int len);
 struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
diff --git a/include/uapi/asm-generic/poll.h b/include/uapi/asm-generic/poll.h
index 41b509f410bf9b7f50f2c2e31542f170ee28f38a..f9c520ce4bf4e4cd3128e298d0d06a415514046e 100644
--- a/include/uapi/asm-generic/poll.h
+++ b/include/uapi/asm-generic/poll.h
@@ -29,7 +29,7 @@
 #define POLLRDHUP       0x2000
 #endif
 
-#define POLLFREE	(__force __poll_t)0x4000	/* currently only for epoll */
+#define POLLFREE	(__force __poll_t)0x4000
 
 #define POLL_BUSY_LOOP	(__force __poll_t)0x8000
 
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 75389bccc1a8d4830f6e1a7f71d5337a00eb7fe2..cc740091082b2ffc83fcbd9a70591987bef6c2a1 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -578,6 +578,14 @@ static ssize_t cgroup_release_agent_write(struct kernfs_open_file *of,
 
 	BUILD_BUG_ON(sizeof(cgrp->root->release_agent_path) < PATH_MAX);
 
+	/*
+	 * Release agent gets called with all capabilities,
+	 * require capabilities to set release agent.
+	 */
+	if ((of->file->f_cred->user_ns != &init_user_ns) ||
+	    !capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	cgrp = cgroup_kn_lock_live(of->kn, false);
 	if (!cgrp)
 		return -ENODEV;
@@ -1045,6 +1053,7 @@ static int cgroup1_remount(struct kernfs_root *kf_root, int *flags, char *data)
 {
 	int ret = 0;
 	struct cgroup_root *root = cgroup_root_from_kf(kf_root);
+	struct cgroup_namespace *ns = current->nsproxy->cgroup_ns;
 	struct cgroup_sb_opts opts;
 	u16 added_mask, removed_mask;
 
@@ -1058,6 +1067,12 @@ static int cgroup1_remount(struct kernfs_root *kf_root, int *flags, char *data)
 	if (opts.subsys_mask != root->subsys_mask || opts.release_agent)
 		pr_warn("option changes via remount are deprecated (pid=%d comm=%s)\n",
 			task_tgid_nr(current), current->comm);
+	/* See cgroup1_mount release_agent handling */
+	if (opts.release_agent &&
+	    ((ns->user_ns != &init_user_ns) || !capable(CAP_SYS_ADMIN))) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
 
 	added_mask = opts.subsys_mask & ~root->subsys_mask;
 	removed_mask = root->subsys_mask & ~opts.subsys_mask;
@@ -1221,6 +1236,15 @@ struct dentry *cgroup1_mount(struct file_system_type *fs_type, int flags,
 		ret = -EPERM;
 		goto out_unlock;
 	}
+	/*
+	 * Release agent gets called with all capabilities,
+	 * require capabilities to set release agent.
+	 */
+	if (opts.release_agent &&
+	    ((ns->user_ns != &init_user_ns) || !capable(CAP_SYS_ADMIN))) {
+		ret = -EINVAL;
+		goto out_unlock;
+	}
 
 	root = kzalloc(sizeof(*root), GFP_KERNEL);
 	if (!root) {
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index 5dd47f1103d18bd769cace68b753088574e02f27..a44a57fb95402b5e374186c19463f6a0354cd3f4 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -209,6 +209,13 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr_e
 }
 EXPORT_SYMBOL_GPL(__wake_up_sync);	/* For internal use only */
 
+void __wake_up_pollfree(struct wait_queue_head *wq_head)
+{
+	__wake_up(wq_head, TASK_NORMAL, 0, poll_to_key(EPOLLHUP | POLLFREE));
+	/* POLLFREE must have cleared the queue. */
+	WARN_ON_ONCE(waitqueue_active(wq_head));
+}
+
 /*
  * Note: we use "set_current_state()" _after_ the wait-queue add,
  * because we need a memory barrier there on SMP, so that any
diff --git a/kernel/sys.c b/kernel/sys.c
index baf60a3aa34b73fa4b46a41e941b32795978e586..f8f66c633dc894ecb98c019396ff7cea55446f63 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1530,6 +1530,8 @@ int do_prlimit(struct task_struct *tsk, unsigned int resource,
 
 	if (resource >= RLIM_NLIMITS)
 		return -EINVAL;
+	resource = array_index_nospec(resource, RLIM_NLIMITS);
+
 	if (new_rlim) {
 		if (new_rlim->rlim_cur > new_rlim->rlim_max)
 			return -EINVAL;
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 935053ee7765dbe84572ab3c7081b7e5f2f9d46b..3e1163ece352a37e053e405f1459e82fcaa339c3 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -130,6 +130,12 @@ int rtnl_is_locked(void)
 }
 EXPORT_SYMBOL(rtnl_is_locked);
 
+bool refcount_dec_and_rtnl_lock(refcount_t *r)
+{
+	return refcount_dec_and_mutex_lock(r, &rtnl_mutex);
+}
+EXPORT_SYMBOL(refcount_dec_and_rtnl_lock);
+
 #ifdef CONFIG_PROVE_LOCKING
 bool lockdep_rtnl_is_held(void)
 {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 753d4121a019d5b4432c43aa3b23ba750d5edb78..6f578a5d837a20dcd0e3ecebc304779ef6a3f594 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -604,28 +604,35 @@ static void fnhe_flush_routes(struct fib_nh_exception *fnhe)
 	}
 }
 
-static struct fib_nh_exception *fnhe_oldest(struct fnhe_hash_bucket *hash)
+static void fnhe_remove_oldest(struct fnhe_hash_bucket *hash)
 {
-	struct fib_nh_exception *fnhe, *oldest;
+	struct fib_nh_exception __rcu **fnhe_p, **oldest_p;
+	struct fib_nh_exception *fnhe, *oldest = NULL;
 
-	oldest = rcu_dereference(hash->chain);
-	for (fnhe = rcu_dereference(oldest->fnhe_next); fnhe;
-	     fnhe = rcu_dereference(fnhe->fnhe_next)) {
-		if (time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp))
+	for (fnhe_p = &hash->chain; ; fnhe_p = &fnhe->fnhe_next) {
+		fnhe = rcu_dereference_protected(*fnhe_p,
+						 lockdep_is_held(&fnhe_lock));
+		if (!fnhe)
+			break;
+		if (!oldest ||
+		    time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) {
 			oldest = fnhe;
+			oldest_p = fnhe_p;
+		}
 	}
 	fnhe_flush_routes(oldest);
-	return oldest;
+	*oldest_p = oldest->fnhe_next;
+	kfree_rcu(oldest, rcu);
 }
 
-static inline u32 fnhe_hashfun(__be32 daddr)
+static u32 fnhe_hashfun(__be32 daddr)
 {
-	static u32 fnhe_hashrnd __read_mostly;
-	u32 hval;
+	static siphash_key_t fnhe_hash_key __read_mostly;
+	u64 hval;
 
-	net_get_random_once(&fnhe_hashrnd, sizeof(fnhe_hashrnd));
-	hval = jhash_1word((__force u32) daddr, fnhe_hashrnd);
-	return hash_32(hval, FNHE_HASH_SHIFT);
+	net_get_random_once(&fnhe_hash_key, sizeof(fnhe_hash_key));
+	hval = siphash_1u32((__force u32)daddr, &fnhe_hash_key);
+	return hash_64(hval, FNHE_HASH_SHIFT);
 }
 
 static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe)
@@ -692,16 +699,21 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
 		if (rt)
 			fill_route_from_fnhe(rt, fnhe);
 	} else {
-		if (depth > FNHE_RECLAIM_DEPTH)
-			fnhe = fnhe_oldest(hash);
-		else {
-			fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC);
-			if (!fnhe)
-				goto out_unlock;
-
-			fnhe->fnhe_next = hash->chain;
-			rcu_assign_pointer(hash->chain, fnhe);
+		/* Randomize max depth to avoid some side channels attacks. */
+		int max_depth = FNHE_RECLAIM_DEPTH +
+				prandom_u32_max(FNHE_RECLAIM_DEPTH);
+
+		while (depth > max_depth) {
+			fnhe_remove_oldest(hash);
+			depth--;
 		}
+
+		fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC);
+		if (!fnhe)
+			goto out_unlock;
+
+		fnhe->fnhe_next = hash->chain;
+
 		fnhe->fnhe_genid = genid;
 		fnhe->fnhe_daddr = daddr;
 		fnhe->fnhe_gw = gw;
@@ -709,6 +721,8 @@ static void update_or_create_fnhe(struct fib_nh *nh, __be32 daddr, __be32 gw,
 		fnhe->fnhe_mtu_locked = lock;
 		fnhe->fnhe_expires = max(1UL, expires);
 
+		rcu_assign_pointer(hash->chain, fnhe);
+
 		/* Exception created; mark the cached routes for the nexthop
 		 * stale, so anyone caching it rechecks if this exception
 		 * applies to them.
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index dad35cd48807e925b80d7c61b5382027f9322556..5188609fca27967e67890f52bf3c745e713619b6 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -45,6 +45,7 @@
 #include <linux/nsproxy.h>
 #include <linux/slab.h>
 #include <linux/jhash.h>
+#include <linux/siphash.h>
 #include <net/net_namespace.h>
 #include <net/snmp.h>
 #include <net/ipv6.h>
@@ -1337,17 +1338,24 @@ static void rt6_exception_remove_oldest(struct rt6_exception_bucket *bucket)
 static u32 rt6_exception_hash(const struct in6_addr *dst,
 			      const struct in6_addr *src)
 {
-	static u32 seed __read_mostly;
-	u32 val;
+	static siphash_key_t rt6_exception_key __read_mostly;
+	struct {
+		struct in6_addr dst;
+		struct in6_addr src;
+	} __aligned(SIPHASH_ALIGNMENT) combined = {
+		.dst = *dst,
+	};
+	u64 val;
 
-	net_get_random_once(&seed, sizeof(seed));
-	val = jhash(dst, sizeof(*dst), seed);
+	net_get_random_once(&rt6_exception_key, sizeof(rt6_exception_key));
 
 #ifdef CONFIG_IPV6_SUBTREES
 	if (src)
-		val = jhash(src, sizeof(*src), val);
+		combined.src = *src;
 #endif
-	return hash_32(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
+	val = siphash(&combined, sizeof(combined), &rt6_exception_key);
+
+	return hash_64(val, FIB6_EXCEPTION_BUCKET_SIZE_SHIFT);
 }
 
 /* Helper function to find the cached rt in the hash table
@@ -1446,6 +1454,7 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	struct rt6_exception_bucket *bucket;
 	struct in6_addr *src_key = NULL;
 	struct rt6_exception *rt6_ex;
+	int max_depth;
 	int err = 0;
 
 	spin_lock_bh(&rt6_exception_lock);
@@ -1507,7 +1516,9 @@ static int rt6_insert_exception(struct rt6_info *nrt,
 	bucket->depth++;
 	net->ipv6.rt6_stats->fib_rt_cache++;
 
-	if (bucket->depth > FIB6_MAX_DEPTH)
+	/* Randomize max depth to avoid some side channels attacks. */
+	max_depth = FIB6_MAX_DEPTH + prandom_u32_max(FIB6_MAX_DEPTH);
+	while (bucket->depth > max_depth)
 		rt6_exception_remove_oldest(bucket);
 
 out:
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 2169366f3207c437cf38191e9fe539d4179f53a8..63dbbdf97776406c7b02c51f2836c8cd91fc7c89 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3750,12 +3750,33 @@ void nf_tables_unbind_set(const struct nft_ctx *ctx, struct nft_set *set,
 }
 EXPORT_SYMBOL_GPL(nf_tables_unbind_set);
 
+void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
+{
+	if (nft_set_is_anonymous(set))
+		nft_clear(ctx->net, set);
+
+	set->use++;
+}
+EXPORT_SYMBOL_GPL(nf_tables_activate_set);
+
+void nf_tables_activate_set(const struct nft_ctx *ctx, struct nft_set *set)
+{
+	if (nft_set_is_anonymous(set))
+		nft_clear(ctx->net, set);
+
+	set->use++;
+}
+EXPORT_SYMBOL_GPL(nf_tables_activate_set);
+
 void nf_tables_deactivate_set(const struct nft_ctx *ctx, struct nft_set *set,
 			      struct nft_set_binding *binding,
 			      enum nft_trans_phase phase)
 {
 	switch (phase) {
 	case NFT_TRANS_PREPARE:
+		if (nft_set_is_anonymous(set))
+			nft_deactivate_next(ctx->net, set);
+
 		set->use--;
 		return;
 	case NFT_TRANS_ABORT:
diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index eb7f9a5f2aeb7878ce15bd3661bf7d1a082047e4..2be1821ff42f7bd211260c6609f3a368d49b43ea 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -249,7 +249,7 @@ static void nft_dynset_activate(const struct nft_ctx *ctx,
 {
 	struct nft_dynset *priv = nft_expr_priv(expr);
 
-	priv->set->use++;
+	nf_tables_activate_set(ctx, priv->set);
 }
 
 static void nft_dynset_destroy(const struct nft_ctx *ctx,
diff --git a/net/netfilter/nft_lookup.c b/net/netfilter/nft_lookup.c
index 55754d9939b50a3e8e3829c165d9911a75c9e275..cb9e937a5ce0256f050c9c6e66ab7e4071c51ea1 100644
--- a/net/netfilter/nft_lookup.c
+++ b/net/netfilter/nft_lookup.c
@@ -132,7 +132,7 @@ static void nft_lookup_activate(const struct nft_ctx *ctx,
 {
 	struct nft_lookup *priv = nft_expr_priv(expr);
 
-	priv->set->use++;
+	nf_tables_activate_set(ctx, priv->set);
 }
 
 static void nft_lookup_destroy(const struct nft_ctx *ctx,
diff --git a/net/netfilter/nft_objref.c b/net/netfilter/nft_objref.c
index bf92a40dd1b2dc62cf027424453c2b7baee84904..eff2173db7e4b52e6dcef6d17fcf4cfbbde25345 100644
--- a/net/netfilter/nft_objref.c
+++ b/net/netfilter/nft_objref.c
@@ -182,7 +182,7 @@ static void nft_objref_map_activate(const struct nft_ctx *ctx,
 {
 	struct nft_objref_map *priv = nft_expr_priv(expr);
 
-	priv->set->use++;
+	nf_tables_activate_set(ctx, priv->set);
 }
 
 static void nft_objref_map_destroy(const struct nft_ctx *ctx,
diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index db34735403035bd327be48658a58d2d553e06491..63d34e702df520493b5ce69629e33fc4cbdd2e2a 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -881,6 +881,7 @@ static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp,
 
 	err = pep_accept_conn(newsk, skb);
 	if (err) {
+		__sock_put(sk);
 		sock_put(newsk);
 		newsk = NULL;
 		goto drop;
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 184c20b86393b4ae68322f21c8ac87cd9182df3b..79113b7b178706f0e964e14f2302b5d556499842 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -539,6 +539,7 @@ static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
 					struct netlink_ext_ack *extack)
 {
 	struct tcf_block *block;
+	int err = 0;
 
 	if (ifindex == TCM_IFINDEX_MAGIC_BLOCK) {
 		block = tcf_block_lookup(net, block_index);
@@ -550,55 +551,93 @@ static struct tcf_block *tcf_block_find(struct net *net, struct Qdisc **q,
 		const struct Qdisc_class_ops *cops;
 		struct net_device *dev;
 
+		rcu_read_lock();
+
 		/* Find link */
-		dev = __dev_get_by_index(net, ifindex);
-		if (!dev)
+		dev = dev_get_by_index_rcu(net, ifindex);
+		if (!dev) {
+			rcu_read_unlock();
 			return ERR_PTR(-ENODEV);
+		}
 
 		/* Find qdisc */
 		if (!*parent) {
 			*q = dev->qdisc;
 			*parent = (*q)->handle;
 		} else {
-			*q = qdisc_lookup(dev, TC_H_MAJ(*parent));
+			*q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
 			if (!*q) {
 				NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
-				return ERR_PTR(-EINVAL);
+				err = -EINVAL;
+				goto errout_rcu;
 			}
 		}
 
+		*q = qdisc_refcount_inc_nz(*q);
+		if (!*q) {
+			NL_SET_ERR_MSG(extack, "Parent Qdisc doesn't exists");
+			err = -EINVAL;
+			goto errout_rcu;
+		}
+
 		/* Is it classful? */
 		cops = (*q)->ops->cl_ops;
 		if (!cops) {
 			NL_SET_ERR_MSG(extack, "Qdisc not classful");
-			return ERR_PTR(-EINVAL);
+			err = -EINVAL;
+			goto errout_rcu;
 		}
 
 		if (!cops->tcf_block) {
 			NL_SET_ERR_MSG(extack, "Class doesn't support blocks");
-			return ERR_PTR(-EOPNOTSUPP);
+			err = -EOPNOTSUPP;
+			goto errout_rcu;
 		}
 
+		/* At this point we know that qdisc is not noop_qdisc,
+		 * which means that qdisc holds a reference to net_device
+		 * and we hold a reference to qdisc, so it is safe to release
+		 * rcu read lock.
+		 */
+		rcu_read_unlock();
+
 		/* Do we search for filter, attached to class? */
 		if (TC_H_MIN(*parent)) {
 			*cl = cops->find(*q, *parent);
 			if (*cl == 0) {
 				NL_SET_ERR_MSG(extack, "Specified class doesn't exist");
-				return ERR_PTR(-ENOENT);
+				err = -ENOENT;
+				goto errout_qdisc;
 			}
 		}
 
 		/* And the last stroke */
 		block = cops->tcf_block(*q, *cl, extack);
-		if (!block)
-			return ERR_PTR(-EINVAL);
+		if (!block) {
+			err = -EINVAL;
+			goto errout_qdisc;
+		}
 		if (tcf_block_shared(block)) {
 			NL_SET_ERR_MSG(extack, "This filter block is shared. Please use the block index to manipulate the filters");
-			return ERR_PTR(-EOPNOTSUPP);
+			err = -EOPNOTSUPP;
+			goto errout_qdisc;
 		}
 	}
 
 	return block;
+
+errout_rcu:
+	rcu_read_unlock();
+errout_qdisc:
+	if (*q)
+		qdisc_put(*q);
+	return ERR_PTR(err);
+}
+
+static void tcf_block_release(struct Qdisc *q, struct tcf_block *block)
+{
+	if (q)
+		qdisc_put(q);
 }
 
 struct tcf_block_owner_item {
@@ -1336,6 +1375,7 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 errout:
 	if (chain)
 		tcf_chain_put(chain);
+	tcf_block_release(q, block);
 	if (err == -EAGAIN)
 		/* Replay the request. */
 		goto replay;
@@ -1457,6 +1497,7 @@ static int tc_del_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 errout:
 	if (chain)
 		tcf_chain_put(chain);
+	tcf_block_release(q, block);
 	return err;
 }
 
@@ -1542,6 +1583,7 @@ static int tc_get_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
 errout:
 	if (chain)
 		tcf_chain_put(chain);
+	tcf_block_release(q, block);
 	return err;
 }
 
@@ -1858,7 +1900,8 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
 	chain_index = tca[TCA_CHAIN] ? nla_get_u32(tca[TCA_CHAIN]) : 0;
 	if (chain_index > TC_ACT_EXT_VAL_MASK) {
 		NL_SET_ERR_MSG(extack, "Specified chain index exceeds upper limit");
-		return -EINVAL;
+		err = -EINVAL;
+		goto errout_block;
 	}
 	chain = tcf_chain_lookup(block, chain_index);
 	if (n->nlmsg_type == RTM_NEWCHAIN) {
@@ -1870,23 +1913,27 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
 				tcf_chain_hold(chain);
 			} else {
 				NL_SET_ERR_MSG(extack, "Filter chain already exists");
-				return -EEXIST;
+				err = -EEXIST;
+				goto errout_block;
 			}
 		} else {
 			if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 				NL_SET_ERR_MSG(extack, "Need both RTM_NEWCHAIN and NLM_F_CREATE to create a new chain");
-				return -ENOENT;
+				err = -ENOENT;
+				goto errout_block;
 			}
 			chain = tcf_chain_create(block, chain_index);
 			if (!chain) {
 				NL_SET_ERR_MSG(extack, "Failed to create filter chain");
-				return -ENOMEM;
+				err = -ENOMEM;
+				goto errout_block;
 			}
 		}
 	} else {
 		if (!chain || tcf_chain_held_by_acts_only(chain)) {
 			NL_SET_ERR_MSG(extack, "Cannot find specified filter chain");
-			return -EINVAL;
+			err = -EINVAL;
+			goto errout_block;
 		}
 		tcf_chain_hold(chain);
 	}
@@ -1930,6 +1977,8 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
 
 errout:
 	tcf_chain_put(chain);
+errout_block:
+	tcf_block_release(q, block);
 	if (err == -EAGAIN)
 		/* Replay the request. */
 		goto replay;
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 0b1dcbcfd9ba4b5c9b8e90be8f896b380f2cc9af..e26eac6101692fdae589673f67a602531bfdfed8 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -315,6 +315,24 @@ struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
 	return q;
 }
 
+struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
+{
+	struct netdev_queue *nq;
+	struct Qdisc *q;
+
+	if (!handle)
+		return NULL;
+	q = qdisc_match_from_root(dev->qdisc, handle);
+	if (q)
+		goto out;
+
+	nq = dev_ingress_queue_rcu(dev);
+	if (nq)
+		q = qdisc_match_from_root(nq->qdisc_sleeping, handle);
+out:
+	return q;
+}
+
 static struct Qdisc *qdisc_leaf(struct Qdisc *p, u32 classid)
 {
 	unsigned long cl;
@@ -921,7 +939,7 @@ static void notify_and_destroy(struct net *net, struct sk_buff *skb,
 		qdisc_notify(net, skb, n, clid, old, new);
 
 	if (old)
-		qdisc_destroy(old);
+		qdisc_put(old);
 }
 
 /* Graft qdisc "new" to class "classid" of qdisc "parent" or
@@ -974,7 +992,7 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 				qdisc_refcount_inc(new);
 
 			if (!ingress)
-				qdisc_destroy(old);
+				qdisc_put(old);
 		}
 
 skip:
@@ -1586,7 +1604,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
 	err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack);
 	if (err) {
 		if (q)
-			qdisc_destroy(q);
+			qdisc_put(q);
 		return err;
 	}
 
diff --git a/net/sched/sch_atm.c b/net/sched/sch_atm.c
index a3084a12239e1355662c5e9e02d7459142b77ed9..ff825f40ea04813e1843c574240dfe1b0fa110c2 100644
--- a/net/sched/sch_atm.c
+++ b/net/sched/sch_atm.c
@@ -150,7 +150,7 @@ static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 	pr_debug("atm_tc_put: destroying\n");
 	list_del_init(&flow->list);
 	pr_debug("atm_tc_put: qdisc %p\n", flow->q);
-	qdisc_destroy(flow->q);
+	qdisc_put(flow->q);
 	tcf_block_put(flow->block);
 	if (flow->sock) {
 		pr_debug("atm_tc_put: f_count %ld\n",
diff --git a/net/sched/sch_cbq.c b/net/sched/sch_cbq.c
index ebc3c8c7e66618db10004690ea4db7326600363f..5e5bccfd7af402ebba7f0b8e26f777cb90d360c0 100644
--- a/net/sched/sch_cbq.c
+++ b/net/sched/sch_cbq.c
@@ -1439,7 +1439,7 @@ static void cbq_destroy_class(struct Qdisc *sch, struct cbq_class *cl)
 	WARN_ON(cl->filters);
 
 	tcf_block_put(cl->block);
-	qdisc_destroy(cl->q);
+	qdisc_put(cl->q);
 	qdisc_put_rtab(cl->R_tab);
 	gen_kill_estimator(&cl->rate_est);
 	if (cl != &q->link)
diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index d5e22452d597682fb491697c760720eb57724523..f95dc899e989ad7e1315dadadb60ca8e6665ffd6 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -452,7 +452,7 @@ static void cbs_destroy(struct Qdisc *sch)
 	cbs_disable_offload(dev, q);
 
 	if (q->qdisc)
-		qdisc_destroy(q->qdisc);
+		qdisc_put(q->qdisc);
 }
 
 static int cbs_dump(struct Qdisc *sch, struct sk_buff *skb)
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index e0b0cf8a993933b06adeeec8798b44fbe9e9cb90..cdebaed0f8cfdc79a4f4902b2d211d03f4b1ff27 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -134,7 +134,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 					    tca[TCA_RATE]);
 		if (err) {
 			NL_SET_ERR_MSG(extack, "Failed to replace estimator");
-			qdisc_destroy(cl->qdisc);
+			qdisc_put(cl->qdisc);
 			kfree(cl);
 			return err;
 		}
@@ -153,7 +153,7 @@ static int drr_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 static void drr_destroy_class(struct Qdisc *sch, struct drr_class *cl)
 {
 	gen_kill_estimator(&cl->rate_est);
-	qdisc_destroy(cl->qdisc);
+	qdisc_put(cl->qdisc);
 	kfree(cl);
 }
 
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
index 1c2fce8c45b2d7d7232c90a6508c9ec6acc6d45f..e0978494aa6ecf28b83c5a42ebbcb5b1da6c18f6 100644
--- a/net/sched/sch_dsmark.c
+++ b/net/sched/sch_dsmark.c
@@ -414,7 +414,7 @@ static void dsmark_destroy(struct Qdisc *sch)
 	pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
 
 	tcf_block_put(p->block);
-	qdisc_destroy(p->q);
+	qdisc_put(p->q);
 	if (p->mv != p->embedded)
 		kfree(p->mv);
 }
diff --git a/net/sched/sch_fifo.c b/net/sched/sch_fifo.c
index 24893d3b5d229d27ec05760815ab222ae052271b..3809c9bf8896af8b8508620710c8fc950659e3e5 100644
--- a/net/sched/sch_fifo.c
+++ b/net/sched/sch_fifo.c
@@ -177,7 +177,7 @@ struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
 	if (q) {
 		err = fifo_set_limit(q, limit);
 		if (err < 0) {
-			qdisc_destroy(q);
+			qdisc_put(q);
 			q = NULL;
 		}
 	}
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index bd96fd261dba3efc7f888d97140287712ea79f0f..67e79cdf48931f042b761bbcf63019f08ad15f5d 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -918,7 +918,7 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
 	if (!ops->init || ops->init(sch, NULL, extack) == 0)
 		return sch;
 
-	qdisc_destroy(sch);
+	qdisc_put(sch);
 	return NULL;
 }
 EXPORT_SYMBOL(qdisc_create_dflt);
@@ -958,7 +958,14 @@ void qdisc_free(struct Qdisc *qdisc)
 	kfree((char *) qdisc - qdisc->padded);
 }
 
-void qdisc_destroy(struct Qdisc *qdisc)
+void qdisc_free_cb(struct rcu_head *head)
+{
+	struct Qdisc *q = container_of(head, struct Qdisc, rcu);
+
+	qdisc_free(q);
+}
+
+static void qdisc_destroy(struct Qdisc *qdisc)
 {
 	const struct Qdisc_ops *ops;
 	struct sk_buff *skb, *tmp;
@@ -967,10 +974,6 @@ void qdisc_destroy(struct Qdisc *qdisc)
 		return;
 	ops = qdisc->ops;
 
-	if (qdisc->flags & TCQ_F_BUILTIN ||
-	    !refcount_dec_and_test(&qdisc->refcnt))
-		return;
-
 #ifdef CONFIG_NET_SCHED
 	qdisc_hash_del(qdisc);
 
@@ -995,9 +998,34 @@ void qdisc_destroy(struct Qdisc *qdisc)
 		kfree_skb_list(skb);
 	}
 
-	qdisc_free(qdisc);
+	call_rcu(&qdisc->rcu, qdisc_free_cb);
+}
+
+void qdisc_put(struct Qdisc *qdisc)
+{
+	if (qdisc->flags & TCQ_F_BUILTIN ||
+	    !refcount_dec_and_test(&qdisc->refcnt))
+		return;
+
+	qdisc_destroy(qdisc);
+}
+EXPORT_SYMBOL(qdisc_put);
+
+/* Version of qdisc_put() that is called with rtnl mutex unlocked.
+ * Intended to be used as optimization, this function only takes rtnl lock if
+ * qdisc reference counter reached zero.
+ */
+
+void qdisc_put_unlocked(struct Qdisc *qdisc)
+{
+	if (qdisc->flags & TCQ_F_BUILTIN ||
+	    !refcount_dec_and_rtnl_lock(&qdisc->refcnt))
+		return;
+
+	qdisc_destroy(qdisc);
+	rtnl_unlock();
 }
-EXPORT_SYMBOL(qdisc_destroy);
+EXPORT_SYMBOL(qdisc_put_unlocked);
 
 /* Attach toplevel qdisc to device queue. */
 struct Qdisc *dev_graft_qdisc(struct netdev_queue *dev_queue,
@@ -1306,7 +1334,7 @@ static void shutdown_scheduler_queue(struct net_device *dev,
 		rcu_assign_pointer(dev_queue->qdisc, qdisc_default);
 		dev_queue->qdisc_sleeping = qdisc_default;
 
-		qdisc_destroy(qdisc);
+		qdisc_put(qdisc);
 	}
 }
 
@@ -1315,7 +1343,7 @@ void dev_shutdown(struct net_device *dev)
 	netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
 	if (dev_ingress_queue(dev))
 		shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
-	qdisc_destroy(dev->qdisc);
+	qdisc_put(dev->qdisc);
 	dev->qdisc = &noop_qdisc;
 
 	WARN_ON(timer_pending(&dev->watchdog_timer));
diff --git a/net/sched/sch_hfsc.c b/net/sched/sch_hfsc.c
index 3278a76f6861576ba7e42cf9f91a62f96443cb3a..b18ec1f6de60cf584f8a2f421c5cbabfca188ff1 100644
--- a/net/sched/sch_hfsc.c
+++ b/net/sched/sch_hfsc.c
@@ -1092,7 +1092,7 @@ hfsc_destroy_class(struct Qdisc *sch, struct hfsc_class *cl)
 	struct hfsc_sched *q = qdisc_priv(sch);
 
 	tcf_block_put(cl->block);
-	qdisc_destroy(cl->qdisc);
+	qdisc_put(cl->qdisc);
 	gen_kill_estimator(&cl->rate_est);
 	if (cl != &q->root)
 		kfree(cl);
diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 43c4bfe625a917e1447b08f1875351f8d22ec2c8..862a33b9e2e0f25b7040f0056506480e1d8625a4 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1224,7 +1224,7 @@ static void htb_destroy_class(struct Qdisc *sch, struct htb_class *cl)
 {
 	if (!cl->level) {
 		WARN_ON(!cl->un.leaf.q);
-		qdisc_destroy(cl->un.leaf.q);
+		qdisc_put(cl->un.leaf.q);
 	}
 	gen_kill_estimator(&cl->rate_est);
 	tcf_block_put(cl->block);
@@ -1425,7 +1425,7 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
 			/* turn parent into inner node */
 			qdisc_reset(parent->un.leaf.q);
 			qdisc_tree_reduce_backlog(parent->un.leaf.q, qlen, backlog);
-			qdisc_destroy(parent->un.leaf.q);
+			qdisc_put(parent->un.leaf.q);
 			if (parent->prio_activity)
 				htb_deactivate(q, parent);
 
diff --git a/net/sched/sch_mq.c b/net/sched/sch_mq.c
index c008a316e94364a3f2e95403b2446362249b40e5..e12b5926b97dabf68ed8df4394ab1f6a0fb57b7d 100644
--- a/net/sched/sch_mq.c
+++ b/net/sched/sch_mq.c
@@ -65,7 +65,7 @@ static void mq_destroy(struct Qdisc *sch)
 	if (!priv->qdiscs)
 		return;
 	for (ntx = 0; ntx < dev->num_tx_queues && priv->qdiscs[ntx]; ntx++)
-		qdisc_destroy(priv->qdiscs[ntx]);
+		qdisc_put(priv->qdiscs[ntx]);
 	kfree(priv->qdiscs);
 }
 
@@ -119,7 +119,7 @@ static void mq_attach(struct Qdisc *sch)
 		qdisc = priv->qdiscs[ntx];
 		old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 		if (old)
-			qdisc_destroy(old);
+			qdisc_put(old);
 #ifdef CONFIG_NET_SCHED
 		if (ntx < dev->real_num_tx_queues)
 			qdisc_hash_add(qdisc, false);
diff --git a/net/sched/sch_mqprio.c b/net/sched/sch_mqprio.c
index 008db8d59acef66770ba28c696e8588e4b47b576..a8fc999080d56b6d9997f4ab554d6ba55607f8d0 100644
--- a/net/sched/sch_mqprio.c
+++ b/net/sched/sch_mqprio.c
@@ -40,7 +40,7 @@ static void mqprio_destroy(struct Qdisc *sch)
 		for (ntx = 0;
 		     ntx < dev->num_tx_queues && priv->qdiscs[ntx];
 		     ntx++)
-			qdisc_destroy(priv->qdiscs[ntx]);
+			qdisc_put(priv->qdiscs[ntx]);
 		kfree(priv->qdiscs);
 	}
 
@@ -300,7 +300,7 @@ static void mqprio_attach(struct Qdisc *sch)
 		qdisc = priv->qdiscs[ntx];
 		old = dev_graft_qdisc(qdisc->dev_queue, qdisc);
 		if (old)
-			qdisc_destroy(old);
+			qdisc_put(old);
 		if (ntx < dev->real_num_tx_queues)
 			qdisc_hash_add(qdisc, false);
 	}
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
index 1df78e361ef9473b3bcdb45b28c577d497639757..1c2f9a3ab1ca704eade5966785363ae16e73649f 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -175,7 +175,7 @@ multiq_destroy(struct Qdisc *sch)
 
 	tcf_block_put(q->block);
 	for (band = 0; band < q->bands; band++)
-		qdisc_destroy(q->queues[band]);
+		qdisc_put(q->queues[band]);
 
 	kfree(q->queues);
 }
@@ -204,7 +204,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt,
 			q->queues[i] = &noop_qdisc;
 			qdisc_tree_reduce_backlog(child, child->q.qlen,
 						  child->qstats.backlog);
-			qdisc_destroy(child);
+			qdisc_put(child);
 		}
 	}
 
@@ -228,7 +228,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt,
 					qdisc_tree_reduce_backlog(old,
 								  old->q.qlen,
 								  old->qstats.backlog);
-					qdisc_destroy(old);
+					qdisc_put(old);
 				}
 				sch_tree_unlock(sch);
 			}
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 02d8d3fd84a5cb211e64cba0014f880db47ed1c0..ad400f4f9a2d620cea783003d732f6151765481a 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -1054,7 +1054,7 @@ static void netem_destroy(struct Qdisc *sch)
 
 	qdisc_watchdog_cancel(&q->watchdog);
 	if (q->qdisc)
-		qdisc_destroy(q->qdisc);
+		qdisc_put(q->qdisc);
 	dist_free(q->delay_dist);
 	dist_free(q->slot_dist);
 }
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 1cbbd8c31405bd4b7fe95de71f58e58b641a915c..0e6f34bd9a683725f568f6485df4314f2c9a32ab 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -175,7 +175,7 @@ prio_destroy(struct Qdisc *sch)
 	tcf_block_put(q->block);
 	prio_offload(sch, NULL);
 	for (prio = 0; prio < q->bands; prio++)
-		qdisc_destroy(q->queues[prio]);
+		qdisc_put(q->queues[prio]);
 }
 
 static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
@@ -205,7 +205,7 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
 					      extack);
 		if (!queues[i]) {
 			while (i > oldbands)
-				qdisc_destroy(queues[--i]);
+				qdisc_put(queues[--i]);
 			return -ENOMEM;
 		}
 	}
@@ -220,7 +220,7 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt,
 
 		qdisc_tree_reduce_backlog(child, child->q.qlen,
 					  child->qstats.backlog);
-		qdisc_destroy(child);
+		qdisc_put(child);
 	}
 
 	for (i = oldbands; i < q->bands; i++) {
diff --git a/net/sched/sch_qfq.c b/net/sched/sch_qfq.c
index bb1a9c11fc549a170172e3d7deaf9693b18e7332..dc37c4ead439bec3cc7414e1c29681eacf236a0c 100644
--- a/net/sched/sch_qfq.c
+++ b/net/sched/sch_qfq.c
@@ -526,7 +526,7 @@ static int qfq_change_class(struct Qdisc *sch, u32 classid, u32 parentid,
 	return 0;
 
 destroy_class:
-	qdisc_destroy(cl->qdisc);
+	qdisc_put(cl->qdisc);
 	kfree(cl);
 	return err;
 }
@@ -537,7 +537,7 @@ static void qfq_destroy_class(struct Qdisc *sch, struct qfq_class *cl)
 
 	qfq_rm_from_agg(q, cl);
 	gen_kill_estimator(&cl->rate_est);
-	qdisc_destroy(cl->qdisc);
+	qdisc_put(cl->qdisc);
 	kfree(cl);
 }
 
diff --git a/net/sched/sch_red.c b/net/sched/sch_red.c
index 56c181c3feeb27a428a56fb76b26d0bc3622ea33..3ce6c0a2c49314b9e0d1136d1d5b9958d0edcde1 100644
--- a/net/sched/sch_red.c
+++ b/net/sched/sch_red.c
@@ -181,7 +181,7 @@ static void red_destroy(struct Qdisc *sch)
 
 	del_timer_sync(&q->adapt_timer);
 	red_offload(sch, false);
-	qdisc_destroy(q->qdisc);
+	qdisc_put(q->qdisc);
 }
 
 static const struct nla_policy red_policy[TCA_RED_MAX + 1] = {
@@ -233,7 +233,7 @@ static int red_change(struct Qdisc *sch, struct nlattr *opt,
 	if (child) {
 		qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
 					  q->qdisc->qstats.backlog);
-		qdisc_destroy(q->qdisc);
+		qdisc_put(q->qdisc);
 		q->qdisc = child;
 	}
 
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index 5e237f978075262ba9e10810e00853dfa0e36939..38cf06515695187a19ea9288a91bcf530e486135 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -472,7 +472,7 @@ static void sfb_destroy(struct Qdisc *sch)
 	struct sfb_sched_data *q = qdisc_priv(sch);
 
 	tcf_block_put(q->block);
-	qdisc_destroy(q->qdisc);
+	qdisc_put(q->qdisc);
 }
 
 static const struct nla_policy sfb_policy[TCA_SFB_MAX + 1] = {
@@ -526,7 +526,7 @@ static int sfb_change(struct Qdisc *sch, struct nlattr *opt,
 
 	qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
 				  q->qdisc->qstats.backlog);
-	qdisc_destroy(q->qdisc);
+	qdisc_put(q->qdisc);
 	q->qdisc = child;
 
 	q->rehash_interval = msecs_to_jiffies(ctl->rehash_interval);
diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 6f74a426f159e440f33755e13656c849408bbc18..dd29de1418b76adbc5d5cc742809807b57eb9de9 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -392,7 +392,7 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt,
 	if (child) {
 		qdisc_tree_reduce_backlog(q->qdisc, q->qdisc->q.qlen,
 					  q->qdisc->qstats.backlog);
-		qdisc_destroy(q->qdisc);
+		qdisc_put(q->qdisc);
 		q->qdisc = child;
 	}
 	q->limit = qopt->limit;
@@ -438,7 +438,7 @@ static void tbf_destroy(struct Qdisc *sch)
 	struct tbf_sched_data *q = qdisc_priv(sch);
 
 	qdisc_watchdog_cancel(&q->watchdog);
-	qdisc_destroy(q->qdisc);
+	qdisc_put(q->qdisc);
 }
 
 static int tbf_dump(struct Qdisc *sch, struct sk_buff *skb)