lockd: double unregister of inetaddr notifiers

lockd_up() can call lockd_unregister_notifiers twice:
inside lockd_start_svc() when it calls lockd_svc_exit_thread()
and then in error path of lockd_up()

Patch forces lockd_start_svc() to unregister notifiers in all error cases
and removes extra unregister in error path of lockd_up().

Fixes: cb7d224f82e4 "lockd: unregister notifier blocks if the service ..."
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Cc: stable@vger.kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index b995bdc139768492fcc9faf4696aefb7850b63de..f04ecfc7ece0c98789161453377890a68094cb34 100644 (file)
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -369,6 +369,7 @@ static int lockd_start_svc(struct svc_serv *serv)
                printk(KERN_WARNING
                        "lockd_up: svc_rqst allocation failed, error=%d\n",
                        error);
+               lockd_unregister_notifiers();
                goto out_rqst;
        }
 
@@ -459,13 +460,16 @@ int lockd_up(struct net *net)
        }
 
        error = lockd_up_net(serv, net);
-       if (error < 0)
-               goto err_net;
+       if (error < 0) {
+               lockd_unregister_notifiers();
+               goto err_put;
+       }
 
        error = lockd_start_svc(serv);
-       if (error < 0)
-               goto err_start;
-
+       if (error < 0) {
+               lockd_down_net(serv, net);
+               goto err_put;
+       }
        nlmsvc_users++;
        /*
         * Note: svc_serv structures have an initial use count of 1,
@@ -476,12 +480,6 @@ err_put:
 err_create:
        mutex_unlock(&nlmsvc_mutex);
        return error;
-
-err_start:
-       lockd_down_net(serv, net);
-err_net:
-       lockd_unregister_notifiers();
-       goto err_put;
 }
 EXPORT_SYMBOL_GPL(lockd_up);