CVE-2022-48735
ALSA: hda: Fix UAF of leds class devs at unbinding
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
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Patch and advisory references
References (4)
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