hwmon: Fix possible NULL pointer

The recent addition of the label attribute added some code that read the
"label" device property, without checking first that "dev" was non-NULL.

Fix this issue by first checking that "dev" is non-NULL.

Fixes: ccd98cba6a18 ("hwmon: Add "label" attribute")
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 6c3a8c6..0d6c680 100644 (file)
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -809,7 +809,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
                hdev->groups = groups;
        }
 
-       if (device_property_present(dev, "label")) {
+       if (dev && device_property_present(dev, "label")) {
                err = device_property_read_string(dev, "label", &label);
                if (err < 0)
                        goto free_hwmon;