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>

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 81d2af0..65c2796 100644 (file)
--- 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 */