On init we have sequence:

for_each_card_prelinks(card, i, dai_link) { ret = snd_soc_add_pcm_runtime(card, dai_link);

ret = init_some_other_things(...); if (ret) goto probe_end:

for_each_card_rtds(card, rtd) { ret = soc_init_pcm_runtime(card, rtd);

probe_end:

while on exit: for_each_card_rtds(card, rtd) snd_soc_link_exit(rtd);

If init_some_other_things() step fails due to error we end up with not fully setup rtds and try to call snd_soc_link_exit on them, which depending on contents on .link_exit handler, can end up dereferencing NULL pointer.

Reviewed-by: Cezary Rojewski cezary.rojewski@intel.com Signed-off-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com --- include/sound/soc.h | 2 ++ sound/soc/soc-core.c | 20 +++++++++++++++----- 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h index 63b57f58cc56..7792c393e238 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -1134,6 +1134,8 @@ struct snd_soc_pcm_runtime { unsigned int pop_wait:1; unsigned int fe_compr:1; /* for Dynamic PCM */

+ bool initialized; + int num_components; struct snd_soc_component *components[]; /* CPU/Codec/Platform */ }; diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 2b8d522eb106..b2bd45e87bc3 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1347,7 +1347,7 @@ static int soc_init_pcm_runtime(struct snd_soc_card *card, snd_soc_runtime_get_dai_fmt(rtd); ret = snd_soc_runtime_set_dai_fmt(rtd, dai_link->dai_fmt); if (ret) - return ret; + goto err;

/* add DPCM sysfs entries */ soc_dpcm_debugfs_add(rtd); @@ -1372,17 +1372,26 @@ static int soc_init_pcm_runtime(struct snd_soc_card *card, /* create compress_device if possible */ ret = snd_soc_dai_compress_new(cpu_dai, rtd, num); if (ret != -ENOTSUPP) - return ret; + goto err;

/* create the pcm */ ret = soc_new_pcm(rtd, num); if (ret < 0) { dev_err(card->dev, "ASoC: can't create pcm %s :%d\n", dai_link->stream_name, ret); - return ret; + goto err; }

- return snd_soc_pcm_dai_new(rtd); + ret = snd_soc_pcm_dai_new(rtd); + if (ret < 0) + goto err; + + rtd->initialized = true; + + return 0; +err: + snd_soc_link_exit(rtd); + return ret; }

static void soc_set_name_prefix(struct snd_soc_card *card, @@ -1980,7 +1989,8 @@ static void soc_cleanup_card_resources(struct snd_soc_card *card)

/* release machine specific resources */ for_each_card_rtds(card, rtd) - snd_soc_link_exit(rtd); + if (rtd->initialized) + snd_soc_link_exit(rtd); /* remove and free each DAI */ soc_remove_link_dais(card); soc_remove_link_components(card);