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Date:   Tue, 4 Sep 2018 02:56:26 +0000
From:   YueHaibing <yuehaibing@...wei.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Sridhar Samudrala <sridhar.samudrala@...el.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        Liran Alon <liran.alon@...cle.com>,
        "Joao Martins" <joao.m.martins@...cle.com>
CC:     YueHaibing <yuehaibing@...wei.com>, <netdev@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH v2 net-next] failover: Add missing check to validate 'slave_dev' in net_failover_slave_unregister

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 <yuehaibing@...wei.com>
---
v2: use WARN_ON_ONCE as Liran Alon suggested
---
 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 7ae1856..5a749dc 100644
--- a/drivers/net/net_failover.c
+++ b/drivers/net/net_failover.c
@@ -603,6 +603,9 @@ 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);

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