From: Nikolay Aleksandrov <[email protected]>
Date: Fri, 16 Nov 2018 18:50:01 +0200
> Syzbot reported a use-after-free of the global vlan context on port vlan
> destruction. When I added per-port vlan stats I missed the fact that the
> global vlan context can be freed before the per-port vlan rcu callback.
> There're a few different ways to deal with this, I've chosen to add a
> new private flag that is set only when per-port stats are allocated so
> we can directly check it on destruction without dereferencing the global
> context at all. The new field in net_bridge_vlan uses a hole.
>
> v2: cosmetic change, move the check to br_process_vlan_info where the
> other checks are done
> v3: add change log in the patch, add private (in-kernel only) flags in a
> hole in net_bridge_vlan struct and use that instead of mixing
> user-space flags with private flags
>
> Fixes: 9163a0fc1f0c ("net: bridge: add support for per-port vlan stats")
> Reported-by: [email protected]
> Signed-off-by: Nikolay Aleksandrov <[email protected]>
Applied.
