[PATCH 4.19 598/639] act_mirred: Fix mirred_init_module error handling

From: Greg Kroah-Hartman
Date: Fri Jan 24 2020 - 06:34:46 EST


From: YueHaibing <yuehaibing@xxxxxxxxxx>

[ Upstream commit 11c9a7d38af524217efb7a176ad322b97ac2f163 ]

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@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <jakub.kicinski@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 399e3beae6cf4..a30c17a282819 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -445,7 +445,11 @@ 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)
--
2.20.1