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ASoC: soc-pcm: crash in snd_soc_dapm_new_dai

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Crash happens in snd_soc_dapm_new_dai() when substream->private_data
access is made and substream is NULL here. This is seen for DAIs where
only playback or capture stream is defined. This seems to be happening
for codec2codec DAI link.

Both playback and capture are 0 during soc_new_pcm(). This is probably
happening because cpu_dai and codec_dai are both validated either for
SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE.

Shouldn't be playback = 1 when,
 - playback stream is available for codec_dai AND
 - capture stream is available for cpu_dai

and vice-versa for capture = 1?

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Link: https://lore.kernel.org/r/1579443563-12287-1-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sameer Pujar 2020-01-19 19:49:23 +05:30 committed by Mark Brown
parent a6947c9d86
commit af4bac1153
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GPG key ID: 24D68B725D5487D0
1 changed files with 2 additions and 2 deletions
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4
sound/soc/soc-pcm.c
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@ -2916,10 +2916,10 @@ int soc_new_pcm(struct snd_soc_pcm_runtime *rtd, int num)
for_each_rtd_codec_dai(rtd, i, codec_dai) {
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_PLAYBACK) &&
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK))
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE))
playback = 1;
if (snd_soc_dai_stream_valid(codec_dai, SNDRV_PCM_STREAM_CAPTURE) &&
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_CAPTURE))
snd_soc_dai_stream_valid(cpu_dai, SNDRV_PCM_STREAM_PLAYBACK))
capture = 1;
}