linux-kernel - Re: [PATCH alt.2] af_packet: Don't use skb after dev_queue

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Message-ID: <20100106194017.GA3354@del.dom.local>
Date:	Wed, 6 Jan 2010 20:40:17 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Michael Breuer <mbreuer@...jas.com>,
	David Miller <davem@...emloft.net>, akpm@...ux-foundation.org,
	flyboy@...il.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH alt.2] af_packet: Don't use skb after dev_queue_xmit()

On Wed, Jan 06, 2010 at 06:49:57AM -0800, Stephen Hemminger wrote:
> On Wed, 6 Jan 2010 09:15:32 +0000
> Jarek Poplawski <jarkao2@...il.com> wrote:
> 
> > tpacket_snd() can change and kfree an skb after dev_queue_xmit(),
> > which is illegal.
> > 
> > With debugging by: Stephen Hemminger <shemminger@...ux-foundation.org>
> > 
> > Reported-by: Michael Breuer <mbreuer@...jas.com>
> > Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
> 
> Good catch.
> Acked-by: Stephen Hemminger <shemminger@...tta.com>

First of all, we're incredibly lucky that such a helpful guy as
Michael had misfortune to hit so helpfully broken piece of hardware ;-)

Thanks,
Jarek P.
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