[PATCH 5.4 030/122] net: micrel: check return value after calling platform_get_resource()

From: Greg Kroah-Hartman
Date: Thu Jul 15 2021 - 14:44:32 EST


From: Yang Yingliang <yangyingliang@xxxxxxxxxx>

[ Upstream commit 20f1932e2282c58cb5ac59517585206cf5b385ae ]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/ethernet/micrel/ks8842.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/micrel/ks8842.c b/drivers/net/ethernet/micrel/ks8842.c
index da329ca115cc..fb838e29d52d 100644
--- a/drivers/net/ethernet/micrel/ks8842.c
+++ b/drivers/net/ethernet/micrel/ks8842.c
@@ -1136,6 +1136,10 @@ static int ks8842_probe(struct platform_device *pdev)
unsigned i;

iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iomem) {
+ dev_err(&pdev->dev, "Invalid resource\n");
+ return -EINVAL;
+ }
if (!request_mem_region(iomem->start, resource_size(iomem), DRV_NAME))
goto err_mem_region;

--
2.30.2