linux-kernel - [PATCH v2 2/6] platform/x86: wmi: Remove ACPI handlers after WMI devices

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

Message-Id: <20231218195531.311179-3-W_Armin@gmx.de>
Date: Mon, 18 Dec 2023 20:55:27 +0100
From: Armin Wolf <W_Armin@....de>
To: hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/6] platform/x86: wmi: Remove ACPI handlers after WMI devices

When removing the ACPI notify/address space handlers, the WMI devices
are still active and might still depend on ACPI EC access or
WMI events.
Fix this by removing the ACPI handlers after all WMI devices
associated with an ACPI device have been removed.

Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Armin Wolf <W_Armin@....de>
---
 drivers/platform/x86/wmi.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c
index 906d3a2831ae..2120c13e1676 100644
--- a/drivers/platform/x86/wmi.c
+++ b/drivers/platform/x86/wmi.c
@@ -1239,13 +1239,12 @@ static void acpi_wmi_remove(struct platform_device *device)
 	struct acpi_device *acpi_device = ACPI_COMPANION(&device->dev);
 	struct device *wmi_bus_device = dev_get_drvdata(&device->dev);

-	acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY,
-				   acpi_wmi_notify_handler);
-	acpi_remove_address_space_handler(acpi_device->handle,
-				ACPI_ADR_SPACE_EC, &acpi_wmi_ec_space_handler);
-
 	device_for_each_child_reverse(wmi_bus_device, NULL, wmi_remove_device);
 	device_unregister(wmi_bus_device);
+
+	acpi_remove_notify_handler(acpi_device->handle, ACPI_ALL_NOTIFY, acpi_wmi_notify_handler);
+	acpi_remove_address_space_handler(acpi_device->handle, ACPI_ADR_SPACE_EC,
+					  &acpi_wmi_ec_space_handler);
 }

 static int acpi_wmi_probe(struct platform_device *device)
--
2.39.2