On 12/4/19 9:14 AM, Takashi Iwai wrote:
The error path of soc_new_pcm_runtime() invokes soc_free_pcm_runtime()
that may cause a few problems. First off, it calls list_del() for
rtd->list that may not be initialized. Similarly,
snd_soc_pcm_component_free() traverses over the component list that
may not be initialized, either. Such access to the uninitialized list
head would lead to either a BUG_ON() or a memory corruption.
This patch fixes the access to uninitialized list heads by
initializing the list heads properly at the beginning before those
error paths.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
sound/soc/soc-core.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 0e2e628302f1..726e5de850c4 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -478,6 +478,12 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
goto free_rtd;
rtd->dev = dev;
+ INIT_LIST_HEAD(&rtd->list);
+ INIT_LIST_HEAD(&rtd->component_list);
+ INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients);
+ INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients);
+ INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients);
+ INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].fe_clients);
dev_set_drvdata(dev, rtd);
INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
@@ -493,12 +499,6 @@ static struct snd_soc_pcm_runtime *soc_new_pcm_runtime(
/*
* rtd remaining settings
*/
- INIT_LIST_HEAD(&rtd->component_list);
- INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].be_clients);
- INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].be_clients);
- INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_PLAYBACK].fe_clients);
- INIT_LIST_HEAD(&rtd->dpcm[SNDRV_PCM_STREAM_CAPTURE].fe_clients);
-
rtd->card = card;
rtd->dai_link = dai_link;
if (!rtd->dai_link->ops)
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