| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 02/51] net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe() | Date | Mon, 3 Aug 2020 14:19:47 +0200 |
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From: Wei Yongjun <weiyongjun1@huawei.com>
[ Upstream commit 297a6961ffb8ff4dc66c9fbf53b924bd1dda05d5 ]
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> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 52703bbd4d666..df75efa96a7d9 100644 --- a/drivers/net/phy/mdio-bcm-unimac.c +++ b/drivers/net/phy/mdio-bcm-unimac.c @@ -237,6 +237,8 @@ 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 -- 2.25.1
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