Field "substream" gets assigned during stream setup in hda_dsp_pcm_hw_params() but it is never cleared afterwards during hda_dsp_pcm_close(). Now, any non-pcm operation e.g.: compress can mistakenly make use of that pointer as it's bypassing all "if (s->substream)" checks. Nulling the pointer during close operation ensures no wild pointers are left behind. Fixes: cdae3b9a47aa ("ASoC: SOF: Intel: Add Intel specific HDA PCM operations") Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx> --- sound/soc/sof/intel/hda-pcm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/sound/soc/sof/intel/hda-pcm.c b/sound/soc/sof/intel/hda-pcm.c index a46a6baa1c3f..4b3a89cf20e7 100644 --- a/sound/soc/sof/intel/hda-pcm.c +++ b/sound/soc/sof/intel/hda-pcm.c @@ -246,5 +246,6 @@ int hda_dsp_pcm_close(struct snd_sof_dev *sdev, /* unbinding pcm substream to hda stream */ substream->runtime->private_data = NULL; + hstream->substream = NULL; return 0; } -- 2.17.1