linux-kernel - [PATCH 2/5] platform/x86: uniwill-laptop: Fix crash on unexpected battery event

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Message-Id: <20260210232946.302936-3-W_Armin@gmx.de>
Date: Wed, 11 Feb 2026 00:29:43 +0100
From: Armin Wolf <W_Armin@....de>
To: hansg@...nel.org,
	ilpo.jarvinen@...ux.intel.com
Cc: wse@...edocomputers.com,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] platform/x86: uniwill-laptop: Fix crash on unexpected battery event

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@....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 856d5e38e045..938e39647be5 100644
--- a/drivers/platform/x86/uniwill/uniwill-acpi.c
+++ b/drivers/platform/x86/uniwill/uniwill-acpi.c
@@ -1355,6 +1355,9 @@ 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