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@huawei.com>
Link: https://lore.kernel.org/r/20210603051014.2674744-1-yangyingliang@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/microchip/sparx5_serdes.c b/drivers/phy/microchip/sparx5_serdes.c
index c8a7d0927ced10d26ef906c9ee95048117cd4a61..4076580fc2cd974c04e231ad7ae8d17c87206221 100644 (file)
--- 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",