diff --git a/qtfs/qtfs/Makefile b/qtfs/qtfs/Makefile
index fb6a51e895b40548b4ab70c537cd490401cecf6b..f3c6014bb8c439afe87ca64c4485a604c1e0fdd3 100644
--- a/qtfs/qtfs/Makefile
+++ b/qtfs/qtfs/Makefile
@@ -1,5 +1,5 @@
 ccflags-y += -I$(src)/../ -I$(src) -DQTFS_CLIENT
-KBUILD=/lib/modules/5.10*/build/
+KBUILD=/lib/modules/$(shell uname -r)/build/
 
 obj-m:=qtfs.o
 qtfs-objs:=qtfs-mod.o sb.o syscall.o ../conn.o xattr.o proc.o ../misc.o miss.o
diff --git a/qtfs/qtfs/sb.c b/qtfs/qtfs/sb.c
index 7303d173f321f9f8d9beaca4845f93ed31fff242..6f7d7347330054edcea67c2ac5c164347cd1fe1b 100644
--- a/qtfs/qtfs/sb.c
+++ b/qtfs/qtfs/sb.c
@@ -337,6 +337,10 @@ ssize_t qtfs_writeiter(struct kiocb *kio, struct iov_iter *iov)
 	ssize_t ret;
 	struct file *filp;
 
+	if (len <= 0) {
+		return len;
+	}
+
 	if (!pvar) {
 		qtfs_err("Failed to get qtfs sock var.");
 		return -EINVAL;
diff --git a/qtfs/qtfs_server/Makefile b/qtfs/qtfs_server/Makefile
index 13f9c3e8a797ad92c11eccb9ac06b999a6b97b0e..c1c5ef6eda6ebc938ef31b3a2c3b9c291ea5cef0 100644
--- a/qtfs/qtfs_server/Makefile
+++ b/qtfs/qtfs_server/Makefile
@@ -1,5 +1,5 @@
 ccflags-y += -I$(src)/../ -I$(src) -DQTFS_SERVER
-KBUILD=/lib/modules/5.10*/build/
+KBUILD=/lib/modules/$(shell uname -r)/build/
 
 obj-m:=qtfs_server.o
 qtfs_server-objs:=../conn.o fsops.o qtfs-server.o ../misc.o