netdev - Re: gro: Fix use after free in tcp_gro

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Message-Id: <20090417.023447.227346165.davem@davemloft.net>
Date:	Fri, 17 Apr 2009 02:34:47 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...r.kernel.org, mwagner@...hat.com
Subject: Re: gro: Fix use after free in tcp_gro_receive

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Fri, 17 Apr 2009 17:25:53 +0800

> gro: Fix use after free in tcp_gro_receive
> 
> After calling skb_gro_receive skb->len can no longer be relied
> on since if the skb was merged using frags, then its pages will
> have been removed and the length reduced.
> 
> This caused tcp_gro_receive to prematurely end merging which
> resulted in suboptimal performance with ixgbe.
> 
> The fix is to store skb->len on the stack.
> 
> Reported-by: Mark Wagner <mwagner@...hat.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied, thanks!
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