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SubjectRe: [PATCH] ASoC: intel: Fix memleak in sst_media_open
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On 8/9/20 3:56 AM, Dinghao Liu wrote:
> When power_up_sst() fails, stream needs to be freed
> just like when try_module_get() fails. However, current
> code is returning directly and ends up leaking memory.
>
> Fixes: 0121327c1a68b ("ASoC: Intel: mfld-pcm: add control for powering up/down dsp")
> Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
> ---
> sound/soc/intel/atom/sst-mfld-platform-pcm.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/sound/soc/intel/atom/sst-mfld-platform-pcm.c b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> index 49b9f18472bc..79fedf9e3da1 100644
> --- a/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> +++ b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
> @@ -330,8 +330,10 @@ static int sst_media_open(struct snd_pcm_substream *substream,
> runtime->private_data = stream;
>
> ret_val = power_up_sst(stream);
> - if (ret_val < 0)
> + if (ret_val < 0) {
> + kfree(stream);
> return ret_val;
> + }
>
> /* Make sure, that the period size is always even */
> snd_pcm_hw_constraint_step(substream->runtime, 0,
>

Alternate suggestion to fix this, it's not great when we mix gotos and
returns.

diff --git a/sound/soc/intel/atom/sst-mfld-platform-pcm.c
b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
index 49b9f18472bc..b1cac7abdc0a 100644
--- a/sound/soc/intel/atom/sst-mfld-platform-pcm.c
+++ b/sound/soc/intel/atom/sst-mfld-platform-pcm.c
@@ -331,7 +331,7 @@ static int sst_media_open(struct snd_pcm_substream
*substream,

ret_val = power_up_sst(stream);
if (ret_val < 0)
- return ret_val;
+ goto out_power_up;

/* Make sure, that the period size is always even */
snd_pcm_hw_constraint_step(substream->runtime, 0,
@@ -340,8 +340,9 @@ static int sst_media_open(struct snd_pcm_substream
*substream,
return snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
out_ops:
- kfree(stream);
mutex_unlock(&sst_lock);
+out_power_up:
+ kfree(stream);
return ret_val;
}
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