From: Doug Kehn <rdkehn@yahoo.com>
Date: Thu, 15 Jul 2010 01:02:16 +0000 (-0700)
Subject: net/core: neighbour update Oops
X-Git-Tag: v2.6.33.7~114
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0a9f8b4059504bbf26e336b843972cedd17d23e0;p=thirdparty%2Fkernel%2Fstable.git

net/core: neighbour update Oops

commit 91a72a70594e5212c97705ca6a694bd307f7a26b upstream.

When configuring DMVPN (GRE + openNHRP) and a GRE remote
address is configured a kernel Oops is observed.  The
obserseved Oops is caused by a NULL header_ops pointer
(neigh->dev->header_ops) in neigh_update_hhs() when

void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *)
= neigh->dev->header_ops->cache_update;

is executed.  The dev associated with the NULL header_ops is
the GRE interface.  This patch guards against the
possibility that header_ops is NULL.

This Oops was first observed in kernel version 2.6.26.8.

Signed-off-by: Doug Kehn <rdkehn@yahoo.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index f35377b643e4e..3fdffe0abc787 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -945,7 +945,10 @@ static void neigh_update_hhs(struct neighbour *neigh)
 {
 	struct hh_cache *hh;
 	void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *)
-		= neigh->dev->header_ops->cache_update;
+		= NULL;
+
+	if (neigh->dev->header_ops)
+		update = neigh->dev->header_ops->cache_update;
 
 	if (update) {
 		for (hh = neigh->hh; hh; hh = hh->hh_next) {