tree 473b882e2365c413e85cef4adfef8ee41a4a819f
parent 8af78b6487856d8a896ba15e9255b8e5fa91eb5f
author Nikolay Aleksandrov <nikolay@cumulusnetworks.com> 1443637012 +0200
committer David S. Miller <davem@davemloft.net> 1443749044 -0700

bridge: vlan: fix possible null vlgrp deref while registering new port

While a new port is being initialized the rx_handler gets set, but the
vlans get initialized later in br_add_if() and in that window if we
receive a frame with a link-local address we can try to dereference
p->vlgrp in:
br_handle_frame() -> br_handle_local_finish() -> br_should_learn()

Fix this by checking vlgrp before using it.

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>