tree 5c6672df72b9d6fac54f0f140bcae856d9d056a0
parent 01085644673f73b47b5c3dae162a542b98e15c90
author Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> 1632511454 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1637830148 +0100

ALSA: hda: hdac_stream: fix potential locking issue in snd_hdac_stream_assign()

commit 1465d06a6d8580e73ae65f8590392df58c5ed2fd upstream.

The fields 'opened', 'running', 'assigned_key' are all protected by a
spinlock, but the spinlock is not taken when looking for a
stream. This can result in a possible race between assign() and
release().

Fix by taking the spinlock before walking through the bus stream list.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210924192417.169243-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: Scott Bruce <smbruce@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>