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

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Message-Id: <20161019.103829.1873231752009765175.davem@davemloft.net>
Date:   Wed, 19 Oct 2016 10:38:29 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     idosch@...sch.org
Cc:     netdev@...r.kernel.org, jiri@...lanox.com, eladr@...lanox.com,
        yotamg@...lanox.com, nogahf@...lanox.com, ogerlitz@...lanox.com,
        dsa@...ulusnetworks.com, idosch@...lanox.com
Subject: Re: [PATCH net] net: core: Correctly iterate over lower adjacency
 list

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

> From: Ido Schimmel <idosch@...lanox.com>
> 
> 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 <idosch@...lanox.com>
> Reported-by: Tamir Winetroub <tamirw@...lanox.com>
> Reviewed-by: Jiri Pirko <jiri@...lanox.com>

Applied.