Re: [PATCH net] net: core: Correctly iterate over lower adjacency list

From: idosch@idosch.org
Date: Wed, 19 Oct 2016 16:57:08 +0300

From: Ido Schimmel <redacted>

Tamir reported the following trace when processing ARP requests received
via a vlan device on top of a VLAN-aware bridge:

 ...

The problem is that netdev_all_lower_get_next_rcu() never advances the
iterator, thereby causing the loop over the lower adjacency list to run
forever.

Fix this by advancing the iterator and avoid the infinite loop.

Fixes: 7ce856aaaf13 ("mlxsw: spectrum: Add couple of lower device helper functions")
Signed-off-by: Ido Schimmel <redacted>
Reported-by: Tamir Winetroub <redacted>
Reviewed-by: Jiri Pirko <redacted>

Applied.