net: fib_rules ordering fixes.

We need to setup the network namespace state before we register
the notifier.  Otherwise if a network device is already registered
we get a nasty NULL pointer dereference.

Signed-off-by: Eric W. Biederman <ebiederm@maxwell.aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 3 deletions

diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c
index 79de3b14a8d1..32b3a0152d7a 100644
--- a/net/core/fib_rules.c
+++ b/net/core/fib_rules.c
@@ -664,17 +664,18 @@ static int __init fib_rules_init(void)
         rtnl_register(PF_UNSPEC, RTM_DELRULE, fib_nl_delrule, NULL);
         rtnl_register(PF_UNSPEC, RTM_GETRULE, NULL, fib_nl_dumprule);
 
-        err = register_netdevice_notifier(&fib_rules_notifier);
+        err = register_pernet_subsys(&fib_rules_net_ops);
         if (err < 0)
                 goto fail;
 
-        err = register_pernet_subsys(&fib_rules_net_ops);
+        err = register_netdevice_notifier(&fib_rules_notifier);
         if (err < 0)
                 goto fail_unregister;
+
         return 0;
 
 fail_unregister:
-        unregister_netdevice_notifier(&fib_rules_notifier);
+        unregister_pernet_subsys(&fib_rules_net_ops);
 fail:
         rtnl_unregister(PF_UNSPEC, RTM_NEWRULE);
         rtnl_unregister(PF_UNSPEC, RTM_DELRULE);