diff options
| author | Hangyu Hua <hbh25y@gmail.com> | 2024-06-03 10:13:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-06-21 15:38:16 +0300 |
| commit | 54c2c171c11a798fe887b3ff72922aa9d1411c1e (patch) | |
| tree | 5b7a9731aec31ca395bac7cb5f15b3ff9e747cd5 | |
| parent | cba5467442b2d5880f5235c7c3a7317d5a9ecbfc (diff) | |
| download | linux-54c2c171c11a798fe887b3ff72922aa9d1411c1e.tar.xz | |
net: sched: sch_multiq: fix possible OOB write in multiq_tune()
[ Upstream commit 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 <hbh25y@gmail.com>
Acked-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/sched/sch_multiq.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c index 75c9c860182b..0d6649d937c9 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; |