ALSA: hda/cs_dsp_ctl: Use private_free for control cleanup

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[ Upstream commit 172811e3a5 ]

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.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 3233b978af ("ALSA: hda: hda_cs_dsp_ctl: Add Library to support CS_DSP ALSA controls")
Link: https://lore.kernel.org/r/20240508095627.44476-1-rf@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Richard Fitzgerald 2024-05-08 10:56:27 +01:00 • committed by Greg Kroah-Hartman

parent 1b5cfb411b

commit 6e359be497

1 changed files with 31 additions and 16 deletions

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sound/pci/hda/hda_cs_dsp_ctl.c

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