From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Sun, 29 Sep 2013 03:40:50 +0000 (+0200)
Subject: ipv6: gre: correct calculation of max_headroom
X-Git-Tag: v3.12-rc4~30^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3da812d860755925da890e8c713f2d2e2d7b1bae;p=pandora-kernel.git

ipv6: gre: correct calculation of max_headroom

gre_hlen already accounts for sizeof(struct ipv6_hdr) + gre header,
so initialize max_headroom to zero. Otherwise the

	if (encap_limit >= 0) {
		max_headroom += 8;
		mtu -= 8;
	}

increments an uninitialized variable before max_headroom was reset.

Found with coverity: 728539

Cc: Dmitry Kozlov <xeb@mail.ru>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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