netdev - [PATCH net-next] act_mirred: Fix mirred_init

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Date:   Wed, 9 Oct 2019 11:10:52 +0800
From:   YueHaibing <yuehaibing@...wei.com>
To:     <jhs@...atatu.com>, <xiyou.wangcong@...il.com>, <jiri@...nulli.us>,
        <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        YueHaibing <yuehaibing@...wei.com>
Subject: [PATCH net-next] 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@...wei.com>
---
 net/sched/act_mirred.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 9d1bf50..d0d397e 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -479,7 +479,11 @@ 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)
-- 
2.7.4