6.9-stable review patch. If anyone has any objections, please let me know.
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From: Nikolay Aleksandrov razor@blackwall.org
[ Upstream commit 546ceb1dfdac866648ec959cbc71d9525bd73462 ]
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: 3a7c1661ae13 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- net/bridge/br_mst.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/bridge/br_mst.c b/net/bridge/br_mst.c index 1de72816b0fb2..1820f09ff59ce 100644 --- a/net/bridge/br_mst.c +++ b/net/bridge/br_mst.c @@ -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;