net/core: neighbour update Oops
authorDoug Kehn <rdkehn@yahoo.com>
Thu, 15 Jul 2010 01:02:16 +0000 (18:02 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 15 Jul 2010 01:02:16 +0000 (18:02 -0700)
commit91a72a70594e5212c97705ca6a694bd307f7a26b
tree98e86dae9f15d98b199c96e18128a71155ce0e8e
parent87fd308cfc6b2e880bf717a740bd5c58d2aed10c
net/core: neighbour update Oops

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>
net/core/neighbour.c