From 5fbe0adac43eb3537c51c3522aff22cf1f7c34b1 Mon Sep 17 00:00:00 2001 From: Hangyu Hua Date: Thu, 20 Jun 2024 18:46:37 +0800 Subject: [PATCH] net: sched: sch_multiq: fix possible OOB write in multiq_tune() mainline inclusion from mainline-v6.10-rc3 commit affc18fdc694190ca7575b9a86632a73b9fe043d category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA6R4J CVE: CVE-2024-36978 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=affc18fdc694190ca7575b9a86632a73b9fe043d -------------------------------- q->bands will be assigned to qopt->bands to execute subsequent code logic after kmalloc. So the old q->bands should not be used in kmalloc. Otherwise, an out-of-bounds write will occur. Fixes: c2999f7fb05b ("net: sched: multiq: don't call qdisc_put() while holding tree lock") Signed-off-by: Hangyu Hua Acked-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Zhengchao Shao --- net/sched/sch_multiq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c index 5c27b4270b90..36068029c35e 100644 --- a/net/sched/sch_multiq.c +++ b/net/sched/sch_multiq.c @@ -186,7 +186,7 @@ static int multiq_tune(struct Qdisc *sch, struct nlattr *opt, qopt->bands = qdisc_dev(sch)->real_num_tx_queues; - removed = kmalloc(sizeof(*removed) * (q->max_bands - q->bands), + removed = kmalloc(sizeof(*removed) * (q->max_bands - qopt->bands), GFP_KERNEL); if (!removed) return -ENOMEM; -- Gitee