linux-kernel - [PATCH 03/20] hwmon: (dme1737) check return value after calling platform_get

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Message-ID: <20220422091207.4034406-4-yangyingliang@huawei.com>
Date:   Fri, 22 Apr 2022 17:11:50 +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 03/20] hwmon: (dme1737) 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: e95c237d78c0 ("hwmon: (dme1737) Add sch311x support")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hwmon/dme1737.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c
index e3ad4c2d0038..90281a016118 100644
--- a/drivers/hwmon/dme1737.c
+++ b/drivers/hwmon/dme1737.c
@@ -2633,6 +2633,8 @@ static int dme1737_isa_probe(struct platform_device *pdev)
 	int err;
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
 	if (!devm_request_region(dev, res->start, DME1737_EXTENT, "dme1737")) {
 		dev_err(dev, "Failed to request region 0x%04x-0x%04x.\n",
 			(unsigned short)res->start,
-- 
2.25.1