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SubjectApplied "ASoC: dpcm: skip missing substream while applying symmetry" to the asoc tree
The patch

ASoC: dpcm: skip missing substream while applying symmetry

has been applied to the asoc tree at

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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From 6246f283d5e02ac757bd8d9bacde8fdc54c4582d Mon Sep 17 00:00:00 2001
From: Jerome Brunet <>
Date: Mon, 1 Apr 2019 15:03:54 +0200
Subject: [PATCH] ASoC: dpcm: skip missing substream while applying symmetry

If for any reason, the backend does not have the requested substream
(like capture on a playback only backend), the BE will be skipped in

However, dpcm_apply_symmetry() does not skip those BE and will
dereference the be_substream (NULL) pointer anyway.

Like in dpcm_be_dai_startup(), just skip those BE.

Fixes: 906c7d690c3b ("ASoC: dpcm: Apply symmetry for DPCM")
Signed-off-by: Jerome Brunet <>
Signed-off-by: Mark Brown <>
sound/soc/soc-pcm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 7fe5321000e8..2d5d5cac4ba6 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1911,10 +1911,15 @@ static int dpcm_apply_symmetry(struct snd_pcm_substream *fe_substream,
struct snd_soc_pcm_runtime *be = dpcm->be;
struct snd_pcm_substream *be_substream =
snd_soc_dpcm_get_substream(be, stream);
- struct snd_soc_pcm_runtime *rtd = be_substream->private_data;
+ struct snd_soc_pcm_runtime *rtd;
struct snd_soc_dai *codec_dai;
int i;

+ /* A backend may not have the requested substream */
+ if (!be_substream)
+ continue;
+ rtd = be_substream->private_data;
if (rtd->dai_link->be_hw_params_fixup)

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