From: Hangyu Hua <hbh25y@gmail.com>
To: jhs@mojatatu.com, xiyou.wangcong@gmail.com, jiri@resnulli.us,
davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, vladbu@mellanox.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Hangyu Hua <hbh25y@gmail.com>
Subject: [PATCH] net: sched: sch_multiq: fix possible OOB write in multiq_tune()
Date: Mon, 3 Jun 2024 15:13:03 +0800 [thread overview]
Message-ID: <20240603071303.17986-1-hbh25y@gmail.com> (raw)
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 <hbh25y@gmail.com>
---
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 79e93a19d5fa..06e03f5cd7ce 100644
--- a/net/sched/sch_multiq.c
+++ b/net/sched/sch_multiq.c
@@ -185,7 +185,7 @@ 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;
--
2.34.1
next reply other threads:[~2024-06-03 7:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-03 7:13 Hangyu Hua [this message]
2024-06-04 15:30 ` [PATCH] net: sched: sch_multiq: fix possible OOB write in multiq_tune() Cong Wang
2024-06-05 10:00 ` patchwork-bot+netdevbpf
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