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net: bridge: mst: fix suspicious rcu usage in br_mst_set_state 

I converted br_mst_set_state to RCU to avoid a vlan use-after-free
but forgot to change the vlan group dereference helper. Switch to vlan
group RCU deref helper to fix the suspicious rcu usage warning.

Fixes: 3a7c1661ae ("net: bridge: mst: fix vlan use-after-free")
Reported-by: syzbot+9bbe2de1bc9d470eb5fe@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9bbe2de1bc9d470eb5fe
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://lore.kernel.org/r/20240609103654.914987-3-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Nikolay Aleksandrov 2024-06-09 13:36:54 +03:00 committed by Jakub Kicinski
parent 36c92936e8
commit 546ceb1dfd
1 changed files with 1 additions and 1 deletions
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2
net/bridge/br_mst.c
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@ -102,7 +102,7 @@ int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,
int err = 0;
rcu_read_lock();
vg = nbp_vlan_group(p);
vg = nbp_vlan_group_rcu(p);
if (!vg)
goto out;