netdev - Re: (3.1.0-rc2-git7) include/linux/inetdevice.h:209 invoked rcu_dereference

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Message-Id: <20110824.175536.2182027080149098383.davem@davemloft.net>
Date:	Wed, 24 Aug 2011 17:55:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	davej@...hat.com, netdev@...r.kernel.org
Subject: Re: (3.1.0-rc2-git7) include/linux/inetdevice.h:209 invoked
 rcu_dereference_check() without protection!

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 23 Aug 2011 07:32:42 +0200

> [PATCH] arp: fix rcu lockdep splat in arp_process()
> 
> Dave Jones reported a lockdep splat triggered by an arp_process() call
> from parp_redo().
> 
> Commit faa9dcf793be (arp: RCU changes) is the origin of the bug, since
> it assumed arp_process() was called under rcu_read_lock(), which is not
> true in this particular path.
> 
> Instead of adding rcu_read_lock() in parp_redo(), I chose to add it in 
> neigh_proxy_process() to take care of IPv6 side too.
...
> Reported-by: Dave Jones <davej@...hat.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied and queued up for -stable, thanks!
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