net: micrel: 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>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
index caa251d..b277139 100644 (file)
--- a/drivers/net/ethernet/micrel/ks8842.c
+++ b/drivers/net/ethernet/micrel/ks8842.c
@@ -1135,6 +1135,10 @@ static int ks8842_probe(struct platform_device *pdev)
        unsigned i;
 
        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!iomem) {
+               dev_err(&pdev->dev, "Invalid resource\n");
+               return -EINVAL;
+       }
        if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
                goto err_mem_region;