netdev - Re: [PATCH net] ipv6: fix headroom calculation in udp6_ufo

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Date:	Tue, 05 Nov 2013 22:10:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	hannes@...essinduktion.org
Cc:	Saran.Neti@...us.com, netdev@...r.kernel.org, pshelar@...ira.com,
	tsl-vulnerability-research@...us.com
Subject: Re: [PATCH net] ipv6: fix headroom calculation in udp6_ufo_fragment

From: Hannes Frederic Sowa <hannes@...essinduktion.org>
Date: Tue, 5 Nov 2013 02:41:27 +0100

> Commit 1e2bd517c108816220f262d7954b697af03b5f9c ("udp6: Fix udp
> fragmentation for tunnel traffic.") changed the calculation if
> there is enough space to include a fragment header in the skb from a
> skb->mac_header dervived one to skb_headroom. Because we already peeled
> off the skb to transport_header this is wrong. Change this back to check
> if we have enough room before the mac_header.
> 
> This fixes a panic Saran Neti reported. He used the tbf scheduler which
> skb_gso_segments the skb. The offsets get negative and we panic in memcpy
> because the skb was erroneously not expanded at the head.
> 
> Reported-by: Saran Neti <Saran.Neti@...us.com>
> Cc: Pravin B Shelar <pshelar@...ira.com>
> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Applied and queued up for -stable, thanks Hannes.
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