[PATCH net 2/2] net: bridge: mst: fix suspicious rcu usage in br_mst_set_state

[Nikolay Aleksandrov]

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+9bbe2de1bc9d470eb...@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9bbe2de1bc9d470eb5fe
Signed-off-by: Nikolay Aleksandrov <ra...@blackwall.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 1de72816b0fb..1820f09ff59c 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;
 
-- 
2.45.1