From: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Date: Thu, 20 Jul 2017 02:41:34 -0700
Subject: tun/tap: Add the missed return value check of
register_netdevice_notifier
Patch-mainline: v4.13-rc4
Git-commit: 5edfbd3c0697e643f179dba819a7c09375b42543
References: bsc#1109837
There is some codes of tun/tap module which did not check the return
value of register_netdevice_notifier. Add the check now.
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/net/tun.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2601,8 +2601,16 @@ static int __init tun_init(void)
goto err_misc;
}
- register_netdevice_notifier(&tun_notifier_block);
+ ret = register_netdevice_notifier(&tun_notifier_block);
+ if (ret) {
+ pr_err("Can't register netdevice notifier\n");
+ goto err_notifier;
+ }
+
return 0;
+
+err_notifier:
+ misc_deregister(&tun_miscdev);
err_misc:
rtnl_link_unregister(&tun_link_ops);
err_linkops: