hwmon: (hp-wmi-sensors) Check if WMI event data exists

The BIOS can choose to return no event data in response to a
WMI event, so the ACPI object passed to the WMI notify handler
can be NULL.

Check for such a situation and ignore the event in such a case.

Fixes: 23902f9 ("hwmon: add HP WMI Sensors driver")
Signed-off-by: Armin Wolf <[email protected]>
Reviewed-by: Ilpo Järvinen <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Guenter Roeck <[email protected]>

Author: Wer-Wolf

drivers/hwmon/hp-wmi-sensors.c

@@ -1637,6 +1637,8 @@ static void hp_wmi_notify(u32 value, void *context)
 		goto out_unlock;
 
 	wobj = out.pointer;
+	if (!wobj)
+		goto out_unlock;
 
 	err = populate_event_from_wobj(dev, &event, wobj);
 	if (err) {