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ASoC: topology: Check return value for snd_soc_add_dai_link() 

snd_soc_add_dai_link() might fail. This situation occurs for
instance in a very specific use case where a PCM device and a
Back End DAI link are given identical names in the topology.
When this happens, soc_new_pcm_runtime() fails and then
snd_soc_add_dai_link() returns -ENOMEM when called from
soc_tplg_fe_link_create(). Because of that, the link will not
get added into the card list, so any attempt to remove it later
ends up in a panic.

Fix that by checking the return status and free the memory in case
of an error.

Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191210003939.15752-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
alistair/sunxi64-5.5-dsi
Dragos Tarcatu 2019-12-09 18:39:38 -06:00 committed by Mark Brown
parent 9c9b652034
commit 76d2703649
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 13 additions and 6 deletions
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19
sound/soc/soc-topology.c
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@ -1933,11 +1933,13 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
ret = soc_tplg_dai_link_load(tplg, link, NULL);
if (ret < 0) {
dev_err(tplg->comp->dev, "ASoC: FE link loading failed\n");
kfree(link->name);
kfree(link->stream_name);
kfree(link->cpus->dai_name);
kfree(link);
return ret;
goto err;
}
ret = snd_soc_add_dai_link(tplg->comp->card, link);
if (ret < 0) {
dev_err(tplg->comp->dev, "ASoC: adding FE link failed\n");
goto err;
}
link->dobj.index = tplg->index;
@ -1945,8 +1947,13 @@ static int soc_tplg_fe_link_create(struct soc_tplg *tplg,
link->dobj.type = SND_SOC_DOBJ_DAI_LINK;
list_add(&link->dobj.list, &tplg->comp->dobj_list);
snd_soc_add_dai_link(tplg->comp->card, link);
return 0;
err:
kfree(link->name);
kfree(link->stream_name);
kfree(link->cpus->dai_name);
kfree(link);
return ret;
}
/* create a FE DAI and DAI link from the PCM object */