ASoC: wm_adsp: Check for buffer in trigger stop

commit 43d147be5738a9ed6cfb25c285ac50d6dd5793be upstream.

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>
Cc: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index b1a5ab95fcc95762650ec05580a9d86d8a274e58..a651fed62a27d0f4e229f4bf6112ee8064e75086 100644 (file)
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -3452,7 +3452,8 @@ 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;