linux-kernel - [PATCH] platform/x86: asus-wmi: Fix racy registrations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20250827052441.23382-1-tiwai@suse.de>
Date: Wed, 27 Aug 2025 07:24:33 +0200
From: Takashi Iwai <tiwai@...e.de>
To: "Luke D . Jones" <luke@...nes.dev>
Cc: Corentin Chary <corentin.chary@...il.com>,
	Hans de Goede <hansg@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Jiri Slaby <jirislaby@...nel.org>,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] platform/x86: asus-wmi: Fix racy registrations

asus_wmi_register_driver() may be called from multiple drivers
concurrently, which can lead to the racy list operations, eventually
corrupting the memory and hitting Oops on some ASUS machines.
Also, the error handling is missing, and it forgot to unregister ACPI
lps0 dev ops in the error case.

This patch covers those issues by introducing a simple mutex at
acpi_wmi_register_driver() & *_unregister_driver, and adding the
proper call of asus_s2idle_check_unregister() in the error path.

Fixes: feea7bd6b02d ("platform/x86: asus-wmi: Refactor Ally suspend/resume")
Link: https://bugzilla.suse.com/show_bug.cgi?id=1246924
Link: https://lore.kernel.org/07815053-0e31-4e8e-8049-b652c929323b@kernel.org
Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/platform/x86/asus-wmi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index f7191fdded14..e72a2b5d158e 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -5088,16 +5088,22 @@ static int asus_wmi_probe(struct platform_device *pdev)
 
 	asus_s2idle_check_register();
 
-	return asus_wmi_add(pdev);
+	ret = asus_wmi_add(pdev);
+	if (ret)
+		asus_s2idle_check_unregister();
+
+	return ret;
 }
 
 static bool used;
+static DEFINE_MUTEX(register_mutex);
 
 int __init_or_module asus_wmi_register_driver(struct asus_wmi_driver *driver)
 {
 	struct platform_driver *platform_driver;
 	struct platform_device *platform_device;
 
+	guard(mutex)(&register_mutex);
 	if (used)
 		return -EBUSY;
 
@@ -5120,6 +5126,7 @@ EXPORT_SYMBOL_GPL(asus_wmi_register_driver);
 
 void asus_wmi_unregister_driver(struct asus_wmi_driver *driver)
 {
+	guard(mutex)(&register_mutex);
 	asus_s2idle_check_unregister();
 
 	platform_device_unregister(driver->platform_device);
-- 
2.50.1