CVE-2024-38388

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

ALSA: hda/cs_dsp_ctl: Use private_free for control cleanup

Use the control private_free callback to free the associated data

block. This ensures that the memory won't leak, whatever way the

control gets destroyed.

The original implementation didn't actually remove the ALSA

controls in hda_cs_dsp_control_remove(). It only freed the internal

tracking structure. This meant it was possible to remove/unload the

amp driver while leaving its ALSA controls still present in the

soundcard. Obviously attempting to access them could cause segfaults

or at least dereferencing stale pointers.