[PATCH AUTOSEL 5.16 38/52] ASoC: SOF: ipc: Add null pointer check for substream->runtime

From: Sasha Levin
Date: Mon Jan 17 2022 - 12:01:26 EST


From: Ajit Kumar Pandey <AjitKumar.Pandey@xxxxxxx>

[ Upstream commit 182b682b9ab1348e07ea1bf9d8f2505cc67f9237 ]

When pcm stream is stopped "substream->runtime" pointer will be set
to NULL by ALSA core. In case host received an ipc msg from firmware
of type IPC_STREAM_POSITION after pcm stream is stopped, there will
be kernel NULL pointer exception in ipc_period_elapsed(). This patch
fixes it by adding NULL pointer check for "substream->runtime".

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Signed-off-by: Ajit Kumar Pandey <AjitKumar.Pandey@xxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211216232422.345164-3-pierre-louis.bossart@xxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/soc/sof/ipc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/sof/ipc.c b/sound/soc/sof/ipc.c
index e6c53c6c470e4..ca30c506a0fd6 100644
--- a/sound/soc/sof/ipc.c
+++ b/sound/soc/sof/ipc.c
@@ -547,7 +547,8 @@ static void ipc_period_elapsed(struct snd_sof_dev *sdev, u32 msg_id)

if (spcm->pcm.compress)
snd_sof_compr_fragment_elapsed(stream->cstream);
- else if (!stream->substream->runtime->no_period_wakeup)
+ else if (stream->substream->runtime &&
+ !stream->substream->runtime->no_period_wakeup)
/* only inform ALSA for period_wakeup mode */
snd_sof_pcm_period_elapsed(stream->substream);
}
--
2.34.1