linux-kernel - [PATCH 15/20] hwmon: (via686a) check return value after calling platform_get

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Message-ID: <20220422091207.4034406-16-yangyingliang@huawei.com>
Date:   Fri, 22 Apr 2022 17:12:02 +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 15/20] hwmon: (via686a) 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: 2ec342e68453 ("hwmon/via686a: Convert to a platform driver")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 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