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ALSA: hda: Fix possible null-ptr-deref when assigning a stream 

[ Upstream commit f93dc90c2e ]

While AudioDSP drivers assign streams exclusively of HOST or LINK type,
nothing blocks a user to attempt to assign a COUPLED stream. As
supplied substream instance may be a stub, what is the case when
code-loading, such scenario ends with null-ptr-deref.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20231006102857.749143-2-cezary.rojewski@intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cezary Rojewski 2023-10-06 12:28:55 +02:00 committed by Greg Kroah-Hartman
parent c23ff8ea21
commit fe7c1a0c2b
1 changed files with 4 additions and 2 deletions
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6
sound/hda/hdac_stream.c
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@ -354,8 +354,10 @@ struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
struct hdac_stream *res = NULL;
/* make a non-zero unique key for the substream */
int key = (substream->pcm->device << 16) | (substream->number << 2) |
(substream->stream + 1);
int key = (substream->number << 2) | (substream->stream + 1);
if (substream->pcm)
key |= (substream->pcm->device << 16);
spin_lock_irq(&bus->reg_lock);
list_for_each_entry(azx_dev, &bus->stream_list, list) {