From e0bb8c44ed5cfcc56b571758ed966ee48779024c Mon Sep 17 00:00:00 2001
From: Wei Zhang <asuka.com@163.com>
Date: Sat, 28 Jun 2014 12:34:53 -0700
Subject: [PATCH] openvswitch: supply a dummy err_handler of gre_cisco_protocol
 to prevent kernel crash

When use gre vport, openvswitch register a gre_cisco_protocol but
does not supply a err_handler with it. The gre_cisco_err() in
net/ipv4/gre_demux.c expect err_handler be provided with the
gre_cisco_protocol implementation, and call ->err_handler() without
existence check, cause the kernel crash.

This patch provide a err_handler to fix this bug.
This bug introduced by commit aa310701e787087d (openvswitch: Add gre
tunnel support.)

Signed-off-by: Wei Zhang <asuka.com@163.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
---
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