Commit e00edb4e authored by Wei Yongjun's avatar Wei Yongjun Committed by David S. Miller

drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio_probe()

platform_get_resource() may fail and return NULL, so we should
better check it's return value to avoid a NULL pointer dereference
since devm_ioremap() does not check input parameters for null.

This is detected by Coccinelle semantic patch.

@@
expression pdev, res, n, t, e, e1, e2;
@@

res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n);
+ if (!res)
+   return -EINVAL;
... when != res == NULL
e = devm_ioremap(e1, res->start, e2);

Fixes: 03f66f06 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
Signed-off-by: default avatarWei Yongjun <weiyongjun1@huawei.com>
Reviewed-by: default avatarGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 41a46913
...@@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev) ...@@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
data->dev = dev; data->dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
data->regs = devm_ioremap(dev, res->start, resource_size(res)); data->regs = devm_ioremap(dev, res->start, resource_size(res));
if (!data->regs) if (!data->regs)
return -ENOMEM; return -ENOMEM;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment