linux-kernel - [PATCH 16/20] hwmon: (vt1211) check return value after calling platform_get

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Message-ID: <20220422091207.4034406-17-yangyingliang@huawei.com>
Date:   Fri, 22 Apr 2022 17:12:03 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-hwmon@...r.kernel.org>
CC:     <linux@...ck-us.net>, <jdelvare@...e.com>
Subject: [PATCH 16/20] hwmon: (vt1211) check return value after calling platform_get_resource()

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

Fixes: ab41319eab3b ("hwmon: New driver for the VIA VT1211")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hwmon/vt1211.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/vt1211.c b/drivers/hwmon/vt1211.c
index 4a5e911d26eb..4b1448e7f1c0 100644
--- a/drivers/hwmon/vt1211.c
+++ b/drivers/hwmon/vt1211.c
@@ -1152,6 +1152,8 @@ static int vt1211_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
 	if (!devm_request_region(dev, res->start, resource_size(res),
 				 DRVNAME)) {
 		dev_err(dev, "Failed to request region 0x%lx-0x%lx\n",
-- 
2.25.1