This is a note to let you know that I've just added the patch titled
ACPI: thermal: Fix acpi_thermal_unregister_thermal_zone() cleanup
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-thermal-fix-acpi_thermal_unregister_thermal_zon.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 4d1a2397dfb5b11d74fd77072755b929cac3d4f2
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Tue Oct 31 12:53:06 2023 +0300
ACPI: thermal: Fix acpi_thermal_unregister_thermal_zone() cleanup
[ Upstream commit 4b27d5c420335dad7aea1aa6e799fe1d05c63b7e ]
The acpi_thermal_unregister_thermal_zone() is paired with
acpi_thermal_register_thermal_zone() so it should mirror it. It should
clean up all the resources that the register function allocated and
leave the stuff that was allocated elsewhere.
Unfortunately, it doesn't call thermal_zone_device_disable(). Also it
calls kfree(tz->trip_table) when it shouldn't. That was allocated in
acpi_thermal_add(). Putting the kfree() here leads to a double free
in the acpi_thermal_add() clean up function.
Likewise, the acpi_thermal_remove() should mirror acpi_thermal_add() so
it should have an explicit kfree(tz->trip_table) as well.
Fixes: ec23c1c462de ("ACPI: thermal: Use trip point table to register thermal zones")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 312730f8272ee..8263508415a8d 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -778,9 +778,9 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
{
+ thermal_zone_device_disable(tz->thermal_zone);
acpi_thermal_zone_sysfs_remove(tz);
thermal_zone_device_unregister(tz->thermal_zone);
- kfree(tz->trip_table);
tz->thermal_zone = NULL;
}
@@ -985,7 +985,7 @@ static void acpi_thermal_remove(struct acpi_device *device)
flush_workqueue(acpi_thermal_pm_queue);
acpi_thermal_unregister_thermal_zone(tz);
-
+ kfree(tz->trip_table);
kfree(tz);
}
