[PATCH 10/20] hwmon: (sch5627) check return value after calling platform_get_resource()

[Yang Yingliang <yangyingliang@huawei.com>]

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

Fixes: a98d506c08ff ("hwmon: New driver for SMSC SCH5627")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/hwmon/sch5627.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/sch5627.c b/drivers/hwmon/sch5627.c
index 25fbbd4c9a2b..1294624a3ed7 100644
--- a/drivers/hwmon/sch5627.c
+++ b/drivers/hwmon/sch5627.c
@@ -423,13 +423,17 @@ static int sch5627_probe(struct platform_device *pdev)
 	struct sch5627_data *data;
 	struct device *hwmon_dev;
 	int err, build_code, build_id, hwmon_rev, val;
+	struct resource *res;
 
 	data = devm_kzalloc(&pdev->dev, sizeof(struct sch5627_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