Scenario when snd_hdac_stream_setup_periods() receives an instance of struct hdac_stream with neither ->substream nor ->cstream initialized is invalid.

Simultaneously addresses "uninitialized symbol 'dmab'" error reported by Smatch.

Fixes: 3e9582267e3a ("ALSA: hda: Interrupt servicing and BDL setup for compress streams") Signed-off-by: Cezary Rojewski cezary.rojewski@intel.com --- sound/hda/hdac_stream.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c index 8f625402505f..547adbc22590 100644 --- a/sound/hda/hdac_stream.c +++ b/sound/hda/hdac_stream.c @@ -500,6 +500,9 @@ int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev) dmab = snd_pcm_get_dma_buf(substream); } else if (cstream) { dmab = snd_pcm_get_dma_buf(cstream); + } else { + WARN(1, "No substream or cstream assigned\n"); + return -EINVAL; }

/* reset BDL address */