net: WIZnet drivers: fix possible NULL dereference

This fixes possible null dereference in probe() function: when both
.mac_addr and .link_gpio are unknown, dev.platform_data may be NULL

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mike Sinkovsky <msink@permonline.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ethernet/wiznet/w5100.c b/drivers/net/ethernet/wiznet/w5100.c
index 18c80982fc6c..a75e9ef5a4ce 100644
--- a/drivers/net/ethernet/wiznet/w5100.c
+++ b/drivers/net/ethernet/wiznet/w5100.c
@@ -682,7 +682,7 @@ static int __devinit w5100_hw_probe(struct platform_device *pdev)
                 return ret;
         priv->irq = irq;
 
-        priv->link_gpio = data->link_gpio;
+        priv->link_gpio = data ? data->link_gpio : -EINVAL;
         if (gpio_is_valid(priv->link_gpio)) {
                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
                 if (!link_name)
diff --git a/drivers/net/ethernet/wiznet/w5300.c b/drivers/net/ethernet/wiznet/w5300.c
index f36addf9d2f6..3306a20ec211 100644
--- a/drivers/net/ethernet/wiznet/w5300.c
+++ b/drivers/net/ethernet/wiznet/w5300.c
@@ -594,7 +594,7 @@ static int __devinit w5300_hw_probe(struct platform_device *pdev)
                 return ret;
         priv->irq = irq;
 
-        priv->link_gpio = data->link_gpio;
+        priv->link_gpio = data ? data->link_gpio : -EINVAL;
         if (gpio_is_valid(priv->link_gpio)) {
                 char *link_name = devm_kzalloc(&pdev->dev, 16, GFP_KERNEL);
                 if (!link_name)