netdev - Re: [PATCH net-next V2] net: keep original skb which only needs header checking during software GSO

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Message-Id: <20140922.145736.1677768375039003963.davem@davemloft.net>
Date:	Mon, 22 Sep 2014 14:57:36 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	eric.dumazet@...il.com
Subject: Re: [PATCH net-next V2] net: keep original skb which only needs
 header checking during software GSO

From: Jason Wang <jasowang@...hat.com>
Date: Fri, 19 Sep 2014 16:04:38 +0800

> Commit ce93718fb7cdbc064c3000ff59e4d3200bdfa744 ("net: Don't keep
> around original SKB when we software segment GSO frames") frees the
> original skb after software GSO even for dodgy gso skbs. This breaks
> the stream throughput from untrusted sources, since only header
> checking was done during software GSO instead of a true
> segmentation. This patch fixes this by freeing the original gso skb
> only when it was really segmented by software.
> 
> Fixes ce93718fb7cdbc064c3000ff59e4d3200bdfa744 ("net: Don't keep
> around original SKB when we software segment GSO frames.")
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied, thanks Jeff.
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