ipv6: route: Fix return value of ip6_neigh_lookup() on neigh_create() error

In ip6_neigh_lookup(), we must not return errors coming from
neigh_create(): if creation of a neighbour entry fails, the lookup should
return NULL, in the same way as it's done in __neigh_lookup().

Otherwise, callers legitimately checking for a non-NULL return value of
the lookup function might dereference an invalid pointer.

For instance, on neighbour table overflow, ndisc_router_discovery()
crashes ndisc_update() by passing ERR_PTR(-ENOBUFS) as 'neigh' argument.

Reported-by: Jianlin Shi <jishi@redhat.com>
Fixes: f8a1b43b709d ("net/ipv6: Create a neigh_lookup for FIB entries")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a94e0b02a8ac..40b225f87d5e 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -210,7 +210,9 @@ struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
         n = __ipv6_neigh_lookup(dev, daddr);
         if (n)
                 return n;
-        return neigh_create(&nd_tbl, daddr, dev);
+
+        n = neigh_create(&nd_tbl, daddr, dev);
+        return IS_ERR(n) ? NULL : n;
 }
 
 static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,