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

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Message-ID: <20200427094032.181184-1-weiyongjun1@huawei.com>
Date:   Mon, 27 Apr 2020 09:40:32 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        Andrew Lunn <andrew@...n.ch>,
        Wei Yongjun <weiyongjun1@...wei.com>
CC:     <linux-omap@...r.kernel.org>, <netdev@...r.kernel.org>,
        <kernel-janitors@...r.kernel.org>
Subject: [PATCH net-next] 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
a bit later in the code.

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);

Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 drivers/net/ethernet/ti/davinci_mdio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/ti/davinci_mdio.c b/drivers/net/ethernet/ti/davinci_mdio.c
index 38b7f6d35759..702fdc393da0 100644
--- a/drivers/net/ethernet/ti/davinci_mdio.c
+++ b/drivers/net/ethernet/ti/davinci_mdio.c
@@ -397,6 +397,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
 	data->dev = dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EINVAL;
 	data->regs = devm_ioremap(dev, res->start, resource_size(res));
 	if (!data->regs)
 		return -ENOMEM;