linux-kernel - [PATCH v2] fix for potential NULL pointer dereference with bare lan743x

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Message-Id: <20201031143619.7086-1-sbauer@blackbox.su>
Date:   Sat, 31 Oct 2020 17:36:18 +0300
From:   Sergej Bauer <sbauer@...ckbox.su>
To:     kuba@...nel.org
Cc:     sbauer@...ckbox.su,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] fix for potential NULL pointer dereference with bare lan743x

Signed-off-by: Sergej Bauer <sbauer@...ckbox.su>
---
 drivers/net/ethernet/microchip/lan743x_ethtool.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index dcde496da7fb..ad38fc9e1468 100644
--- a/drivers/net/ethernet/microchip/lan743x_ethtool.c
+++ b/drivers/net/ethernet/microchip/lan743x_ethtool.c
@@ -780,7 +780,9 @@ static void lan743x_ethtool_get_wol(struct net_device *netdev,
 
 	wol->supported = 0;
 	wol->wolopts = 0;
-	phy_ethtool_get_wol(netdev->phydev, wol);
+
+	if (netdev->phydev)
+		phy_ethtool_get_wol(netdev->phydev, wol);
 
 	wol->supported |= WAKE_BCAST | WAKE_UCAST | WAKE_MCAST |
 		WAKE_MAGIC | WAKE_PHY | WAKE_ARP;
@@ -792,6 +794,7 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 				   struct ethtool_wolinfo *wol)
 {
 	struct lan743x_adapter *adapter = netdev_priv(netdev);
+	int ret;
 
 	adapter->wolopts = 0;
 	if (wol->wolopts & WAKE_UCAST)
@@ -809,9 +812,12 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 
 	device_set_wakeup_enable(&adapter->pdev->dev, (bool)wol->wolopts);
 
-	phy_ethtool_set_wol(netdev->phydev, wol);
+	if (netdev->phydev)
+		ret = phy_ethtool_set_wol(netdev->phydev, wol);
+	else
+		ret = -EIO;
 
-	return 0;
+	return ret;
 }
 #endif /* CONFIG_PM */
 
-- 
2.20.1