[PATCH AUTOSEL 4.18 057/126] failover: Add missing check to validate 'slave_dev' in net_failover_slave_unregister

[Sasha Levin]

From: YueHaibing <yuehaib...@huawei.com>

[ Upstream commit 9e7e6cabf371cc008cb2244a04c012b516753693 ]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/net_failover.c: In function 'net_failover_slave_unregister':
drivers/net/net_failover.c:598:35: warning:
 variable 'primary_dev' set but not used [-Wunused-but-set-variable]

There should check the validity of 'slave_dev'.

Fixes: cfc80d9a1163 ("net: Introduce net_failover driver")

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
Acked-by: Sridhar Samudrala <sridhar.samudr...@intel.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/net/net_failover.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/net_failover.c b/drivers/net/net_failover.c
index 4f390fa557e4..8ec02f1a3be8 100644
--- a/drivers/net/net_failover.c
+++ b/drivers/net/net_failover.c
@@ -602,6 +602,9 @@ static int net_failover_slave_unregister(struct net_device 
*slave_dev,
        primary_dev = rtnl_dereference(nfo_info->primary_dev);
        standby_dev = rtnl_dereference(nfo_info->standby_dev);
 
+       if (WARN_ON_ONCE(slave_dev != primary_dev && slave_dev != standby_dev))
+               return -ENODEV;
+
        vlan_vids_del_by_dev(slave_dev, failover_dev);
        dev_uc_unsync(slave_dev, failover_dev);
        dev_mc_unsync(slave_dev, failover_dev);
-- 
2.17.1