Fixes: out of array access
Fixes: 
29868/clusterfuzz-testcase-minimized-ffmpeg_dem_CINE_fuzzer-5692001957445632

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/cinedec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/cinedec.c b/libavformat/cinedec.c
index c6c0d927ee..e5c6468c39 100644
--- a/libavformat/cinedec.c
+++ b/libavformat/cinedec.c
@@ -288,7 +288,7 @@ static int cine_read_packet(AVFormatContext *avctx, 
AVPacket *pkt)
     AVIOContext *pb = avctx->pb;
     int n, size, ret;
 
-    if (cine->pts >= st->duration)
+    if (cine->pts >= st->internal->nb_index_entries)
         return AVERROR_EOF;
 
     avio_seek(pb, st->internal->index_entries[cine->pts].pos, SEEK_SET);
-- 
2.17.1

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