[PATCH 17/20] hwmon: (vt8231) 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: ec5e1a4b8faa ("hwmon: Convert vt8231 to a platform driver")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
---
 drivers/hwmon/vt8231.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
index 03275ac8ba72..394ba989b7ae 100644
--- a/drivers/hwmon/vt8231.c
+++ b/drivers/hwmon/vt8231.c
@@ -783,6 +783,8 @@ static int vt8231_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, VT8231_EXTENT,
 				 vt8231_driver.driver.name)) {
 		dev_err(&pdev->dev, "Region 0x%lx-0x%lx already in use!\n",
-- 
2.25.1