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

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Message-Id: <20201029002845.28984-1-sbauer@blackbox.su>
Date:   Thu, 29 Oct 2020 03:28:45 +0300
From:   Sergej Bauer <sbauer@...ckbox.su>
To:     unlisted-recipients:; (no To-header on input)
Cc:     sbauer@...ckbox.su,
        Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fix for potential NULL pointer dereference with bare lan743x

  This is just a minor fix which prevents a kernel NULL pointer
dereference when using phy-less lan743x.

Signed-off-by: Sergej Bauer <sbauer@...ckbox.su>
---
 drivers/net/ethernet/microchip/lan743x_ethtool.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_ethtool.c b/drivers/net/ethernet/microchip/lan743x_ethtool.c
index dcde496da7fb..354d72d550f2 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;
@@ -793,6 +795,9 @@ static int lan743x_ethtool_set_wol(struct net_device *netdev,
 {
 	struct lan743x_adapter *adapter = netdev_priv(netdev);
 
+	if (!netdev->phydev)
+		return -EIO;
+
 	adapter->wolopts = 0;
 	if (wol->wolopts & WAKE_UCAST)
 		adapter->wolopts |= WAKE_UCAST;
-- 
2.20.1