[PATCHv2] ASoC: xilinx: formatter_pcm: fix stream_data leak on open error

[Vincenzo Frascino]

On 11/08/2026 19:51, Rosen Penev wrote:
> In xlnx_formatter_pcm_open(), stream_data is allocated and
> adata->play_stream or adata->capture_stream is assigned early.  If a
> later step, such as snd_pcm_hw_constraint_step() or
> snd_pcm_hw_constraint_integer(), fails, the function returns the error
> immediately.  ALSA does not call the close callback when open fails, so
> stream_data is leaked and the stream pointer is left dangling, pointing
> to a substream that ALSA frees.  A later interrupt would then call
> snd_pcm_period_elapsed() on the freed substream.
> 
> Free stream_data and clear the stream pointer on the error paths.
> 
> Fixes: 6f6c3c36f091 ("ASoC: xlnx: add pcm formatter platform driver")
> Assisted-by: opencode:deepseek-v4-flash-free
> Signed-off-by: Rosen Penev <rosenp at gmail.com>
> Reviewed-by: Michal Simek <michal.simek at amd.com>

Reviewed-by: Vincenzo Frascino <vincenzo.frascino at arm.com>

> ---
>  v2: change goto label from err to error.
>  sound/soc/xilinx/xlnx_formatter_pcm.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/xilinx/xlnx_formatter_pcm.c b/sound/soc/xilinx/xlnx_formatter_pcm.c
> index b50306b0fc06..3d6f1e4046d8 100644
> --- a/sound/soc/xilinx/xlnx_formatter_pcm.c
> +++ b/sound/soc/xilinx/xlnx_formatter_pcm.c
> @@ -383,7 +383,7 @@ static int xlnx_formatter_pcm_open(struct snd_soc_component *component,
>  	if (err) {
>  		dev_err(component->dev,
>  			"Unable to set constraint on period bytes\n");
> -		return err;
> +		goto error;
>  	}
>  
>  	/* Resize the buffer bytes as divisible by 64 */
> @@ -393,7 +393,7 @@ static int xlnx_formatter_pcm_open(struct snd_soc_component *component,
>  	if (err) {
>  		dev_err(component->dev,
>  			"Unable to set constraint on buffer bytes\n");
> -		return err;
> +		goto error;
>  	}
>  
>  	/* Set periods as integer multiple */
> @@ -402,7 +402,7 @@ static int xlnx_formatter_pcm_open(struct snd_soc_component *component,
>  	if (err < 0) {
>  		dev_err(component->dev,
>  			"Unable to set constraint on periods to be integer\n");
> -		return err;
> +		goto error;
>  	}
>  
>  	/* enable DMA IOC irq */
> @@ -411,6 +411,14 @@ static int xlnx_formatter_pcm_open(struct snd_soc_component *component,
>  	writel(val, stream_data->mmio + XLNX_AUD_CTRL);
>  
>  	return 0;
> +
> +error:
> +	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
> +		adata->play_stream = NULL;
> +	else
> +		adata->capture_stream = NULL;
> +	kfree(stream_data);
> +	return err;
>  }
>  
>  static int xlnx_formatter_pcm_close(struct snd_soc_component *component,

-- 
Regards,
Vincenzo