act_mirred: Fix mirred_init_module error handling

If tcf_register_action failed, mirred_device_notifier
should be unregistered.

Fixes: 3b87956ea645 ("net sched: fix race in mirred device removal")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 9ce073a05414ae3289190446cb6cee057588f07d..08923b21e56607f4b163dafa4e2f97d348a34061 100644 (file)
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -484,7 +484,11 @@ static int __init mirred_init_module(void)
                return err;
 
        pr_info("Mirror/redirect action on\n");
-       return tcf_register_action(&act_mirred_ops, &mirred_net_ops);
+       err = tcf_register_action(&act_mirred_ops, &mirred_net_ops);
+       if (err)
+               unregister_netdevice_notifier(&mirred_device_notifier);
+
+       return err;
 }
 
 static void __exit mirred_cleanup_module(void)