linux-kernel - [PATCH -next] phy: Sparx5 Eth SerDes: check return value after calling platform_get

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Date:   Thu, 3 Jun 2021 13:10:14 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-phy@...ts.infradead.org>
CC:     <vkoul@...nel.org>, <steen.hegelund@...rochip.com>
Subject: [PATCH -next] phy: Sparx5 Eth SerDes: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/phy/microchip/sparx5_serdes.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/microchip/sparx5_serdes.c b/drivers/phy/microchip/sparx5_serdes.c
index c8a7d0927ced..4076580fc2cd 100644
--- a/drivers/phy/microchip/sparx5_serdes.c
+++ b/drivers/phy/microchip/sparx5_serdes.c
@@ -2470,6 +2470,10 @@ static int sparx5_serdes_probe(struct platform_device *pdev)
 	priv->coreclock = clock;
 
 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!iores) {
+		dev_err(priv->dev, "Invalid resource\n");
+		return -EINVAL;
+	}
 	iomem = devm_ioremap(priv->dev, iores->start, resource_size(iores));
 	if (IS_ERR(iomem)) {
 		dev_err(priv->dev, "Unable to get serdes registers: %s\n",
-- 
2.25.1