CVE-2022-48735

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.