netdev - [PATCH net v2] net: mdio-ipq4019: fix possible invalid pointer dereference

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Date:   Thu, 17 Nov 2022 17:05:14 +0800
From:   Hui Tang <tanghui20@...wei.com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <mw@...ihalf.com>, <linux@...linux.org.uk>, <andrew@...n.ch>,
        <pabeni@...hat.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yusongping@...wei.com>
Subject: [PATCH net v2] net: mdio-ipq4019: fix possible invalid pointer dereference

priv->eth_ldo_rdy is saved the return value of devm_ioremap_resource(),
which !IS_ERR() should be used to check.

Fixes: 23a890d493e3 ("net: mdio: Add the reset function for IPQ MDIO driver")
Signed-off-by: Hui Tang <tanghui20@...wei.com>
---
v1 -> v2: set priv->eth_ldo_rdy NULL, if devm_ioremap_resource() failed
---
 drivers/net/mdio/mdio-ipq4019.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index 4eba5a91075c..dfd1647eac36 100644
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -231,8 +231,11 @@ static int ipq4019_mdio_probe(struct platform_device *pdev)
 	/* The platform resource is provided on the chipset IPQ5018 */
 	/* This resource is optional */
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (res)
+	if (res) {
 		priv->eth_ldo_rdy = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(priv->eth_ldo_rdy))
+			priv->eth_ldo_rdy = NULL;
+	}
 
 	bus->name = "ipq4019_mdio";
 	bus->read = ipq4019_mdio_read;
-- 
2.17.1