ALSA: hda: hdac_stream: fix potential locking issue in snd_hdac_stream_assign()
commit 1465d06a 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>
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