From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 3 Mar 2014 12:18:36 +0000 (+0800)
Subject: ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer
X-Git-Tag: v3.14-rc6~30^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=10ddceb22bab11dab10ba645c7df2e4a8e7a5db5;p=pandora-kernel.git

ip_tunnel:multicast process cause panic due to skb->_skb_refdst NULL pointer

when ip_tunnel process multicast packets, it may check if the packet is looped
back packet though 'rt_is_output_route(skb_rtable(skb))' in ip_tunnel_rcv(),
but before that , skb->_skb_refdst has been dropped in iptunnel_pull_header(),
so which leads to a panic.

fix the bug: https://bugzilla.kernel.org/show_bug.cgi?id=70681

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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