dccp: call inet_add_protocol after register_pernet_subsys in dccp_v6_init

Patch "call inet_add_protocol after register_pernet_subsys in dccp_v4_init"
fixed a null pointer dereference issue for dccp_ipv4 module.

The same fix is needed for dccp_ipv6 module.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 9926211..4fccc0c 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1098,33 +1098,33 @@ static int __init dccp_v6_init(void)
 {
        int err = proto_register(&dccp_v6_prot, 1);
 
-       if (err != 0)
+       if (err)
                goto out;
 
-       err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
-       if (err != 0)
-               goto out_unregister_proto;
-
        inet6_register_protosw(&dccp_v6_protosw);
 
        err = register_pernet_subsys(&dccp_v6_ops);
-       if (err != 0)
+       if (err)
                goto out_destroy_ctl_sock;
+
+       err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
+       if (err)
+               goto out_unregister_proto;
+
 out:
        return err;
-
+out_unregister_proto:
+       unregister_pernet_subsys(&dccp_v6_ops);
 out_destroy_ctl_sock:
-       inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
        inet6_unregister_protosw(&dccp_v6_protosw);
-out_unregister_proto:
        proto_unregister(&dccp_v6_prot);
        goto out;
 }
 
 static void __exit dccp_v6_exit(void)
 {
-       unregister_pernet_subsys(&dccp_v6_ops);
        inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
+       unregister_pernet_subsys(&dccp_v6_ops);
        inet6_unregister_protosw(&dccp_v6_protosw);
        proto_unregister(&dccp_v6_prot);
 }