netdev - Re: [PATCH net-next v2] drivers: net: davinci_mdio: fix potential NULL dereference in davinci_mdio

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Date:   Fri, 01 May 2020 15:28:17 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     weiyongjun1@...wei.com
Cc:     grygorii.strashko@...com, david@...hnology.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net-next v2] drivers: net: davinci_mdio: fix potential
 NULL dereference in davinci_mdio_probe()

From: Wei Yongjun <weiyongjun1@...wei.com>
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@...wei.com>
> Reviewed-by: Grygorii Strashko <grygorii.strashko@...com>

Applied.