netdev - Re: [NET]: Fix csum_start update in pskb_expand

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Message-Id: <20071015.014634.58769774.davem@davemloft.net>
Date:	Mon, 15 Oct 2007 01:46:34 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	guichaz@...oo.fr, netdev@...r.kernel.org
Subject: Re: [NET]: Fix csum_start update in pskb_expand_head

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 15 Oct 2007 12:57:23 +0800

> On Sun, Oct 14, 2007 at 08:20:37PM +0000, Guillaume Chazarain wrote:
> > 
> > Just another data point, it seems that running the standard Bittorrent
> > client helps triggering the bug.
> 
> Doh! It was my patch a month ago which added code to update
> csum_start if the headroom changed that broke this.
> 
> We'll need this patch for stable as well.
> 
> [NET]: Fix csum_start update in pskb_expand_head
> 
> I got confused by the dual nature of the off variable in the
> function pskb_expand_head.  The csum_start offset should use
> nhead instead of off which can change depending on whether we
> are using offsets or pointers.
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied and I'll take care of the -stable submission.
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