linux-kernel - [PATCH v3] platform/x86: alienware-wmi-wmax: Fix null pointer dereference in sleep handlers

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Message-Id: <20251014-sleep-fix-v3-1-b5cb58da4638@gmail.com>
Date: Tue, 14 Oct 2025 05:07:27 -0500
From: Kurt Borja <kuurtb@...il.com>
To: Hans de Goede <hansg@...nel.org>, 
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
 Armin Wolf <W_Armin@....de>
Cc: platform-driver-x86@...r.kernel.org, Dell.Client.Kernel@...l.com, 
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
 Gal Hammer <galhammer@...il.com>, Kurt Borja <kuurtb@...il.com>
Subject: [PATCH v3] platform/x86: alienware-wmi-wmax: Fix null pointer
 dereference in sleep handlers

Devices without the AWCC interface don't initialize `awcc`. Add a check
before dereferencing it in sleep handlers.

Cc: stable@...r.kernel.org
Reported-by: Gal Hammer <galhammer@...il.com>
Tested-by: Gal Hammer <galhammer@...il.com>
Fixes: 07ac275981b1 ("platform/x86: alienware-wmi-wmax: Add support for manual fan control")
Signed-off-by: Kurt Borja <kuurtb@...il.com>
---
Changes in v3:
- Fix typo in title
- Go for a simpler approach because the last one prevented the old
  driver interface from loading
- Link to v2: https://lore.kernel.org/r/20251013-sleep-fix-v2-1-1ad8bdb79585@gmail.com

Changes in v2:
- Little logic mistake in the `force_gmode` path... (oops)
- Link to v1: https://lore.kernel.org/r/20251013-sleep-fix-v1-1-92bc11b6ecae@gmail.com
---
 drivers/platform/x86/dell/alienware-wmi-wmax.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/dell/alienware-wmi-wmax.c b/drivers/platform/x86/dell/alienware-wmi-wmax.c
index 31f9643a6a3b..b106e8e407b3 100644
--- a/drivers/platform/x86/dell/alienware-wmi-wmax.c
+++ b/drivers/platform/x86/dell/alienware-wmi-wmax.c
@@ -1639,7 +1639,7 @@ static int wmax_wmi_probe(struct wmi_device *wdev, const void *context)
 
 static int wmax_wmi_suspend(struct device *dev)
 {
-	if (awcc->hwmon)
+	if (awcc && awcc->hwmon)
 		awcc_hwmon_suspend(dev);
 
 	return 0;
@@ -1647,7 +1647,7 @@ static int wmax_wmi_suspend(struct device *dev)
 
 static int wmax_wmi_resume(struct device *dev)
 {
-	if (awcc->hwmon)
+	if (awcc && awcc->hwmon)
 		awcc_hwmon_resume(dev);
 
 	return 0;

---
base-commit: 3ed17349f18774c24505b0c21dfbd3cc4f126518
change-id: 20251012-sleep-fix-5d0596dd92a3

-- 
 ~ Kurt