linux-kernel - [PATCH 14/20] hwmon: (smsc47m1) check return value after calling platform_get

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Message-ID: <20220422091207.4034406-15-yangyingliang@huawei.com>
Date:   Fri, 22 Apr 2022 17:12:01 +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 14/20] hwmon: (smsc47m1) 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: 51f2cca1f72d ("hwmon/smsc47m1: Convert to a platform driver")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hwmon/smsc47m1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hwmon/smsc47m1.c b/drivers/hwmon/smsc47m1.c
index 37531b5c8254..0dc432af7b18 100644
--- a/drivers/hwmon/smsc47m1.c
+++ b/drivers/hwmon/smsc47m1.c
@@ -719,6 +719,8 @@ static int __init smsc47m1_probe(struct platform_device *pdev)
 	};
 
 	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
 	err = smsc47m1_handle_resources(res->start, sio_data->type,
 					REQUEST, dev);
 	if (err < 0)
-- 
2.25.1