[X/A/B][SRU][PATCH 1/1] net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()

[Po-Hsu Lin]

From: Wei Yongjun <weiyongjun1 at huawei.com>

CVE-2018-8043

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 at huawei.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5)
Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.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 4bde5e7..fd8692b 100644
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ b/drivers/net/phy/mdio-bcm-unimac.c
@@ -177,6 +177,8 @@ 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
-- 
2.7.4