From: Dragos Tarcatu <dragos_tarcatu@xxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@xxxxxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
sound/soc/soc-topology.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 248530d028a6..93ba6778ef27 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -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 */
--
2.20.1
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