netdev - Re: [PATCH] net: gro: make sure skb->cb[] initial content has not to be zero

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Message-Id: <20140516.172546.1197385833815835361.davem@davemloft.net>
Date:	Fri, 16 May 2014 17:25:46 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	timo.teras@....fi, edumazet@...gle.com, netdev@...r.kernel.org,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH] net: gro: make sure skb->cb[] initial content has not
 to be zero

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 16 May 2014 11:34:37 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Starting from linux-3.13, GRO attempts to build full size skbs.
> 
> Problem is the commit assumed one particular field in skb->cb[]
> was clean, but it is not the case on some stacked devices.
> 
> Timo reported a crash in case traffic is decrypted before
> reaching a GRE device.
> 
> Fix this by initializing NAPI_GRO_CB(skb)->last at the right place,
> this also removes one conditional.
> 
> Thanks a lot to Timo for providing full reports and bisecting this.
> 
> Fixes: 8a29111c7ca6 ("net: gro: allow to build full sized skb")
> Bisected-by: Timo Teras <timo.teras@....fi>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
> Please Timo test this patch so that we confirm it fixes the bug for you.

Applied and queued up for -stable, thanks everyone.
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