linux-kernel - Re: [PATCH] ASoC: intel: Fix memleak in sst_media

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Date:   Mon, 10 Aug 2020 09:34:43 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        "Subhransu S. Prusty" <subhransu.s.prusty@...el.com>,
        Vinod Koul <vkoul@...nel.org>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: intel: Fix memleak in sst_media_open



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@....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;
  }