[alsa-devel] [PATCH v2 6/6] pcm:plug: save converter config

[Takashi Iwai]

On Mon, 27 Feb 2017 08:36:32 +0100,
sutar.mounesh at gmail.com wrote:
> 
> From: Andreas Pape <apape at de.adit-jv.com>
> 
> Passed config is freed after call to open, thus it is invalid when
> trying to extract the converter name. So config entry is saved
> for later usage.
> 
> Signed-off-by: Andreas Pape <apape at de.adit-jv.com>
> Signed-off-by: Mounesh Sutar <sutar.mounesh at gmail.com>
> 
> diff --git a/src/pcm/pcm_plug.c b/src/pcm/pcm_plug.c
> index 266707b..ad0e99e 100644
> --- a/src/pcm/pcm_plug.c
> +++ b/src/pcm/pcm_plug.c
> @@ -64,6 +64,8 @@ static int snd_pcm_plug_close(snd_pcm_t *pcm)
>  	snd_pcm_plug_t *plug = pcm->private_data;
>  	int err, result = 0;
>  	free(plug->ttable);
> +	if (plug->rate_converter)
> +		snd_config_delete((snd_config_t*)plug->rate_converter);

Set NULL after calling snd_config_delete(), so that it won't
double-free.

>  	assert(plug->gen.slave == plug->req_slave);
>  	if (plug->gen.close_slave) {
>  		snd_pcm_unlink_hw_ptr(pcm, plug->req_slave);
> @@ -1108,7 +1110,13 @@ int snd_pcm_plug_open(snd_pcm_t **pcmp,
>  	plug->sformat = sformat;
>  	plug->schannels = schannels;
>  	plug->srate = srate;
> -	plug->rate_converter = rate_converter;
> +	if (rate_converter) {
> +		if ((err = snd_config_copy((snd_config_t**)&plug->rate_converter,
> +					   (snd_config_t *)rate_converter)) < 0)
> +			free(plug);
> +			return err;

Missing braces.  It'll go out unconditionally.
Did you really try this patch and confirm to work...?


thanks,

Takashi