linux-kernel - [PATCH AUTOSEL 4.18 057/126] failover: Add missing check to validate 'slave_dev' in net_failover_slave

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Message-Id: <20181031230754.29029-57-sashal@kernel.org>
Date:   Wed, 31 Oct 2018 19:06:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     YueHaibing <yuehaibing@...wei.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 057/126] failover: Add missing check to validate 'slave_dev' in net_failover_slave_unregister

From: YueHaibing <yuehaibing@...wei.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 <yuehaibing@...wei.com>
Acked-by: Sridhar Samudrala <sridhar.samudrala@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.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