net: sgi: ioc3-eth: 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/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
index 6eef0f45b133beda41ddff121a37e354266adb69..2b29fd4cbdf44e4840ed9c020faee1ea502018f8 100644 (file)
--- a/drivers/net/ethernet/sgi/ioc3-eth.c
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -835,6 +835,10 @@ static int ioc3eth_probe(struct platform_device *pdev)
        int err;
 
        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!regs) {
+               dev_err(&pdev->dev, "Invalid resource\n");
+               return -EINVAL;
+       }
        /* get mac addr from one wire prom */
        if (ioc3eth_get_mac_addr(regs, mac_addr))
                return -EPROBE_DEFER; /* not available yet */