On 2/27/17 1:04 PM, Cong Wang wrote:

quoted

                for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
+                       /* do not allow deletion of the null route */
+                       if (rt == net->ipv6.ip6_null_entry)
+                               continue;

Fixes: 0ae8133586ad net: ipv6: Allow shorthand delete of all nexthops in
multipath route

Note, I moved the check into __ip6_del_rt_siblings() because __ip6_del_rt()
has a same check.

that's b/c __ip6_del_rt has a second call path. __ip6_del_rt_siblings is
new and is not expecting to see the null entry. Catching it before the
dst_hold would be better.