ipv6: Fix neigh lookup using NULL device.
In some of the rt6_bind_neighbour() call sites, it hasn't hooked
up the rt->dst.dev pointer yet, so we'd deref a NULL pointer when
obtaining dev->ifindex for the neighbour hash function computation.
Just pass the netdevice explicitly in to fix this problem.
Reported-by: Bjarke Istrup Pedersen <gurligebis@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 30de9e7..4a62c47 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -129,11 +129,14 @@
return neigh_create(&nd_tbl, daddr, dst->dev);
}
-static int rt6_bind_neighbour(struct rt6_info *rt)
+static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev)
{
- struct neighbour *n = ip6_neigh_lookup(&rt->dst, &rt->rt6i_gateway);
- if (IS_ERR(n))
- return PTR_ERR(n);
+ struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway);
+ if (!n) {
+ n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev);
+ if (IS_ERR(n))
+ return PTR_ERR(n);
+ }
dst_set_neighbour(&rt->dst, n);
return 0;
@@ -746,7 +749,7 @@
#endif
retry:
- if (rt6_bind_neighbour(rt)) {
+ if (rt6_bind_neighbour(rt, rt->dst.dev)) {
struct net *net = dev_net(rt->dst.dev);
int saved_rt_min_interval =
net->ipv6.sysctl.ip6_rt_gc_min_interval;
@@ -1397,7 +1400,7 @@
rt->rt6i_prefsrc.plen = 0;
if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) {
- err = rt6_bind_neighbour(rt);
+ err = rt6_bind_neighbour(rt, dev);
if (err)
goto out;
}
@@ -2084,7 +2087,7 @@
rt->rt6i_flags |= RTF_ANYCAST;
else
rt->rt6i_flags |= RTF_LOCAL;
- err = rt6_bind_neighbour(rt);
+ err = rt6_bind_neighbour(rt, rt->dst.dev);
if (err) {
dst_free(&rt->dst);
return ERR_PTR(err);