From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Tue, 5 Nov 2013 01:41:27 +0000 (+0100)
Subject: ipv6: fix headroom calculation in udp6_ufo_fragment
X-Git-Tag: v3.13-rc1~105^2~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0e033e04c2678dbbe74a46b23fffb7bb918c288e;p=pandora-kernel.git

ipv6: fix headroom calculation in udp6_ufo_fragment

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@telus.com>
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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