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

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Message-ID: <20221115045028.182441-1-tanghui20@huawei.com>
Date:   Tue, 15 Nov 2022 12:50:28 +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: 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>
---
 drivers/net/mdio/mdio-ipq4019.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-ipq4019.c b/drivers/net/mdio/mdio-ipq4019.c
index 4eba5a91075c..d7a1f7c56f97 100644
--- a/drivers/net/mdio/mdio-ipq4019.c
+++ b/drivers/net/mdio/mdio-ipq4019.c
@@ -188,7 +188,7 @@ static int ipq_mdio_reset(struct mii_bus *bus)
 	/* To indicate CMN_PLL that ethernet_ldo has been ready if platform resource 1
 	 * is specified in the device tree.
 	 */
-	if (priv->eth_ldo_rdy) {
+	if (!IS_ERR(priv->eth_ldo_rdy)) {
 		val = readl(priv->eth_ldo_rdy);
 		val |= BIT(0);
 		writel(val, priv->eth_ldo_rdy);
-- 
2.17.1