Fixes invalid writes with invalid multichannel streams.

CC:[email protected]
---
 libavcodec/opusdec.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/opusdec.c b/libavcodec/opusdec.c
index bf3a54b..771922e 100644
--- a/libavcodec/opusdec.c
+++ b/libavcodec/opusdec.c
@@ -500,6 +500,12 @@ static int opus_decode_packet(AVCodecContext *avctx, void 
*data,
                 av_log(avctx, AV_LOG_ERROR, "Error parsing the packet 
header.\n");
                 return ret;
             }
+            if (coded_samples != s->packet.frame_count * 
s->packet.frame_duration) {
+                av_log(avctx, AV_LOG_ERROR,
+                       "Mismatching coded sample count in substream %d.\n", i);
+                return AVERROR_INVALIDDATA;
+            }
+
             s->silk_samplerate = get_silk_samplerate(s->packet.config);
         }
 
-- 
2.0.0

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