netdev - Re: [PATCH v2] af-packet: fix oops when socket is not present

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Date:	Wed, 07 Nov 2012 15:42:48 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric@...it.org
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2] af-packet: fix oops when socket is not present

From: Eric Leblond <eric@...it.org>
Date: Tue,  6 Nov 2012 13:10:10 +0100

> Due to a NULL dereference, the following patch is causing oops
> in normal trafic condition:
> 
> commit c0de08d04215031d68fa13af36f347a6cfa252ca
> Author: Eric Leblond <eric@...it.org>
> Date:   Thu Aug 16 22:02:58 2012 +0000
> 
>     af_packet: don't emit packet on orig fanout group
> 
> This buggy patch was a feature fix and has reached most stable
> branches.
> 
> When skb->sk is NULL and when packet fanout is used, there is a
> crash in match_fanout_group where skb->sk is accessed.
> This patch fixes the issue by returning false as soon as the
> socket is NULL: this correspond to the wanted behavior because
> the kernel as to resend the skb to all the listening socket in
> this case.
> 
> Signed-off-by: Eric Leblond <eric@...it.org>

Applied and queued up for -stable, thanks.
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