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net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()

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

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wei Yongjun 2018-01-11 11:21:51 +00:00 committed by David S. Miller
parent ecb10288a3
commit 297a6961ff
1 changed files with 2 additions and 0 deletions
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2
drivers/net/phy/mdio-bcm-unimac.c
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@ -205,6 +205,8 @@ static int unimac_mdio_probe(struct platform_device *pdev)
return -ENOMEM;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -EINVAL;
/* Just ioremap, as this MDIO block is usually integrated into an
* Ethernet MAC controller register range