From c8965932a2e3b70197ec02c6741c29460279e2a8 Mon Sep 17 00:00:00 2001
From: Susant Sahani <susant@redhat.com>
Date: Sat, 10 May 2014 00:11:32 +0530
Subject: [PATCH] ip6_tunnel: fix potential NULL pointer dereference

The function ip6_tnl_validate assumes that the rtnl
attribute IFLA_IPTUN_PROTO always be filled . If this
attribute is not filled by  the userspace application
kernel get crashed with NULL pointer dereference. This
patch fixes the potential kernel crash when
IFLA_IPTUN_PROTO is missing .

Signed-off-by: Susant Sahani <susant@redhat.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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