From: Paolo Abeni <pab...@redhat.com>
Date: Wed, 6 Mar 2019 10:42:53 +0100
> If a non local multicast packet reaches ip_route_input_rcu() while
> the ingress device IPv4 private data (in_dev) is NULL, we end up
> doing a NULL pointer dereference in IN_DEV_MFORWARD().
>
> Since the later call to ip_route_input_mc() is going to fail if
> !in_dev, we can fail early in such scenario and avoid the dangerous
> code path.
>
> v1 -> v2:
> - clarified the commit message, no code changes
>
> Reported-by: Tianhao Zhao <tiz...@redhat.com>
> Fixes: e58e41596811 ("net: Enable support for VRF with ipv4 multicast")
> Signed-off-by: Paolo Abeni <pab...@redhat.com>
> Reviewed-by: David Ahern <dsah...@gmail.com>
Applied and queued up for -stable.
