[PATCH 15/20] hwmon: (via686a) check return value after calling platform_get_resource()

[Yang Yingliang]

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

Fixes: 2ec342e68453 ("hwmon/via686a: Convert to a platform driver")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/hwmon/via686a.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/via686a.c b/drivers/hwmon/via686a.c
index 55634110c2f9..f4e0a56498f8 100644
--- a/drivers/hwmon/via686a.c
+++ b/drivers/hwmon/via686a.c
@@ -671,6 +671,8 @@ static int via686a_probe(struct platform_device *pdev)
 
 	/* Reserve the ISA region */
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
 	if (!devm_request_region(&pdev->dev, res->start, VIA686A_EXTENT,
 				 via686a_driver.driver.name)) {
 		dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
-- 
2.25.1