linux-kernel - [PATCH 11/20] hwmon: (sch5636) check return value after calling platform_get

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Date:   Fri, 22 Apr 2022 17:11:58 +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 11/20] hwmon: (sch5636) 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: 0772a6407939 ("hwmon: New driver sch5636")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hwmon/sch5636.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/sch5636.c b/drivers/hwmon/sch5636.c
index 269757bc3a9e..6fc471168af8 100644
--- a/drivers/hwmon/sch5636.c
+++ b/drivers/hwmon/sch5636.c
@@ -394,13 +394,17 @@ static int sch5636_probe(struct platform_device *pdev)
 	struct sch5636_data *data;
 	int i, err, val, revision[2];
 	char id[4];
+	struct resource *res;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(struct sch5636_data),
 			    GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	data->addr = platform_get_resource(pdev, IORESOURCE_IO, 0)->start;
+	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+	if (!res)
+		return -EINVAL;
+	data->addr = res->start;
 	mutex_init(&data->update_lock);
 	platform_set_drvdata(pdev, data);
 
-- 
2.25.1