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

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Message-ID: <20121106122848.GB20904@kroah.com>
Date:	Tue, 6 Nov 2012 13:28:48 +0100
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Eric Leblond <eric@...it.org>
Cc:	netdev <netdev@...r.kernel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2] af-packet: fix oops when socket is not present

On Tue, Nov 06, 2012 at 01:10:10PM +0100, Eric Leblond wrote:
> 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>
> ---
>  net/core/dev.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read Documentation/stable_kernel_rules.txt
for how to do this properly.

</formletter>
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