diff options
| author | Wei Yongjun <weiyongjun1@huawei.com> | 2018-01-11 14:21:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-05 11:06:47 +0300 |
| commit | 9e06953ee2a406c4bf4ff08c700d3ce1254974d1 (patch) | |
| tree | d23ba2f8766055ca3ee3ef0dfd2dbf4c45638010 /drivers | |
| parent | 3a156abd24346a3188eb7e88cf86386a409e0d02 (diff) | |
| download | linux-9e06953ee2a406c4bf4ff08c700d3ce1254974d1.tar.xz | |
net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe()
[ 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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/phy/mdio-bcm-unimac.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-bcm-unimac.c b/drivers/net/phy/mdio-bcm-unimac.c index 52703bbd4d66..df75efa96a7d 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 |