[PATCH net-next] net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()

[Wei Yongjun]

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 <weiyongj...@huawei.com>
---
 drivers/net/phy/mdio-bcm-unimac.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/mdio-bcm-unimac.c 
b/drivers/net/phy/mdio-bcm-unimac.c
index 08e0647..8d37066 100644
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ b/drivers/net/phy/mdio-bcm-unimac.c
@@ -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