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Filename Latest commit message Latest commit date
Yuhao Jiang 3f803ccf5a ACPI: video: Fix use-after-free in acpi_video_switch_brightness()
commit 8f067aa59430266386b83c18b983ca583faa6a11 upstream.

The switch_brightness_work delayed work accesses device->brightness
and device->backlight, freed by acpi_video_dev_unregister_backlight()
during device removal.

If the work executes after acpi_video_bus_unregister_backlight()
frees these resources, it causes a use-after-free when
acpi_video_switch_brightness() dereferences device->brightness or
device->backlight.

Fix this by calling cancel_delayed_work_sync() for each device's
switch_brightness_work in acpi_video_bus_remove_notify_handler()
after removing the notify handler that queues the work. This ensures
the work completes before the memory is freed.

Fixes: 8ab58e8e7e ("ACPI / video: Fix backlight taking 2 steps on a brightness up/down keypress")
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Yuhao Jiang <danisjiang@gmail.com>
Reviewed-by: Hans de Goede <hansg@kernel.org>
[ rjw: Changelog edit ]
Link: https://patch.msgid.link/20251022200704.2655507-1-danisjiang@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-12-03 12:45:04 +01:00
arch x86/bugs: Fix reporting of LFENCE retpoline 2025-12-03 12:45:04 +01:00
block
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Documentation
drivers ACPI: video: Fix use-after-free in acpi_video_switch_brightness() 2025-12-03 12:45:04 +01:00
fs btrfs: use smp_mb__after_atomic() when forcing COW in create_pending_snapshot() 2025-12-03 12:45:04 +01:00
include net/sched: sch_qfq: Fix null-deref in agg_dequeue 2025-12-03 12:45:04 +01:00
init
ipc
kernel padata: Reset next CPU when reorder sequence wraps around 2025-10-29 14:00:01 +01:00
lib
LICENSES
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net net/sched: sch_qfq: Fix null-deref in agg_dequeue 2025-12-03 12:45:04 +01:00
samples
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security KEYS: trusted_tpm1: Compare HMAC values in constant time 2025-10-29 14:00:01 +01:00
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Makefile Linux 5.4.301 2025-10-29 14:00:02 +01:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.