[alsa-devel] [PATCH 3/7] ASoC: topology: Fix memory leak from soc_tplg_denum_create_texts

[Pierre-Louis Bossart]

On 1/26/19 11:43 AM, Takashi Iwai wrote:
> On Fri, 25 Jan 2019 21:06:44 +0100,
> Pierre-Louis Bossart wrote:
>> From: Amadeusz Sławiński <amadeuszx.slawinski at intel.com>
>>
>> dtexts is two dimensional array, so we also need to free it after
>> freeing its fields.
>>
>> Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski at intel.com>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
>> ---
>>   sound/soc/soc-topology.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
>> index abc2d804d5bf..71bc5b8a9bd3 100644
>> --- a/sound/soc/soc-topology.c
>> +++ b/sound/soc/soc-topology.c
>> @@ -410,6 +410,7 @@ static void remove_enum(struct snd_soc_component *comp,
>>   	kfree(dobj->control.dvalues);
>>   	for (i = 0; i < se->items; i++)
>>   		kfree(dobj->control.dtexts[i]);
>> +	kfree(dobj->control.dtexts);
>>   	kfree(se);
>>   }
>>   
>> @@ -467,6 +468,7 @@ static void remove_widget(struct snd_soc_component *comp,
>>   			kfree(dobj->control.dvalues);
>>   			for (j = 0; j < se->items; j++)
>>   				kfree(dobj->control.dtexts[j]);
>> +			kfree(dobj->control.dtexts);
>>   
>>   			kfree(se);
>>   			kfree(w->kcontrol_news[i].name);
>> @@ -1361,6 +1363,7 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
>>   		kfree(se->dobj.control.dvalues);
>>   		for (j = 0; j < ec->items; j++)
>>   			kfree(se->dobj.control.dtexts[j]);
>> +		kfree(se->dobj.control.dtexts);
>>   
>>   		kfree(se);
>>   		kfree(kc[i].name);
> It's interesting that this patch shows three places doing the very
> same thing.  It's worth to make a common helper, I suppose.

Good point indeed, thanks for the suggestion. We'd probably need to dig 
deeper here. There is one loop that uses ce->items and the others 
se->items, the two variables seem similar but we'd need to figure out if 
this is correct.

If that's alright with you I'd prefer to add this helper in a follow-up 
patch.

-Pierre