[PATCH v4 2/4] platform/x86: uniwill-laptop: Fix crash on unexpected battery event

[Armin Wolf <W_Armin@gmx.de>]

On devices that have not UNIWILL_FEATURE_BATTERY set, the underlying
hardware might still send the UNIWILL_OSD_BATTERY_ALERT event. In such
a situation, the driver will access uninitialized data structures when
handling said event.

Prevent this by only handling the UNIWILL_OSD_BATTERY_ALERT event when
UNIWILL_FEATURE_BATTERY is set.

Fixes: d050479693bb ("platform/x86: Add Uniwill laptop driver")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/platform/x86/uniwill/uniwill-acpi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/uniwill/uniwill-acpi.c b/drivers/platform/x86/uniwill/uniwill-acpi.c
index 2abae9faceb7..03694e51d0ae 100644
--- a/drivers/platform/x86/uniwill/uniwill-acpi.c
+++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
@@ -1359,6 +1359,9 @@ static int uniwill_notifier_call(struct notifier_block *nb, unsigned long action
 
 	switch (action) {
 	case UNIWILL_OSD_BATTERY_ALERT:
+		if (!uniwill_device_supports(data, UNIWILL_FEATURE_BATTERY))
+			return NOTIFY_DONE;
+
 		mutex_lock(&data->battery_lock);
 		list_for_each_entry(entry, &data->batteries, head) {
 			power_supply_changed(entry->battery);
-- 
2.39.5