linux-kernel - [PATCH 20/20] hwmon: (w83781d) check return value after calling platform_get

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Message-ID: <20220422091207.4034406-21-yangyingliang@huawei.com>
Date:   Fri, 22 Apr 2022 17:12:07 +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 20/20] hwmon: (w83781d) 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: 7666c13c627f ("hwmon/w83781d: No longer use i2c-isa")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hwmon/w83781d.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/w83781d.c b/drivers/hwmon/w83781d.c
index b3579721265f..4fe6eec02570 100644
--- a/drivers/hwmon/w83781d.c
+++ b/drivers/hwmon/w83781d.c
@@ -1767,6 +1767,8 @@ w83781d_isa_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 + W83781D_ADDR_REG_OFFSET, 2,
 				 "w83781d"))
-- 
2.25.1