Vulnerability CVE-2022-48735
Published: 2024-06-20

Description:
In the Linux kernel, the following vulnerability has been resolved:

ALSA: hda: Fix UAF of leds class devs at unbinding

The LED class devices that are created by HD-audio codec drivers are
registered via devm_led_classdev_register() and associated with the
HD-audio codec device. Unfortunately, it turned out that the devres
release doesn't work for this case; namely, since the codec resource
release happens before the devm call chain, it triggers a NULL
dereference or a UAF for a stale set_brightness_delay callback.

For fixing the bug, this patch changes the LED class device register
and unregister in a manual manner without devres, keeping the
instances in hda_gen_spec.

 References:
https://git.kernel.org/stable/c/a7de1002135cf94367748ffc695a29812d7633b5
https://git.kernel.org/stable/c/0e629052f013eeb61494d4df2f1f647c2a9aef47
https://git.kernel.org/stable/c/813e9f3e06d22e29872d4fd51b54992d89cf66c8
https://git.kernel.org/stable/c/549f8ffc7b2f7561bea7f90930b6c5104318e87b
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