ASoC: wm_adsp: Check for buffer in trigger stop

Trigger stop can be called in situations where trigger start failed
and as such it can't be assumed the buffer is already attached to
the compressed stream or a NULL pointer may be dereferenced.

Fixes: 639e5eb3c7d6 ("ASoC: wm_adsp: Correct handling of compressed streams that restart")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 5608ed5deccace2a64b9e3726da7ffda03b4f1ec..b0b48eb9c7c91578cb5d588955a0afa74f0ff262 100644 (file)
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -3587,7 +3587,8 @@ int wm_adsp_compr_trigger(struct snd_compr_stream *stream, int cmd)
                }
                break;
        case SNDRV_PCM_TRIGGER_STOP:
-               wm_adsp_buffer_clear(compr->buf);
+               if (wm_adsp_compr_attached(compr))
+                       wm_adsp_buffer_clear(compr->buf);
                break;
        default:
                ret = -EINVAL;