From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
Date: Wed, 29 Apr 2020 02:52:20 +0000
> 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: 03f66f067560 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
> Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Applied.
