Fixes: memleak
Fixes: 
32146/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5377612845285376

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/mov.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index add1e94641..3436fb6b73 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5501,6 +5501,11 @@ static int mov_read_coll(MOVContext *c, AVIOContext *pb, 
MOVAtom atom)
     }
     avio_skip(pb, 3); /* flags */
 
+    if (sc->coll){
+        av_log(c->fc, AV_LOG_WARNING, "Ignoring duplicate COLL\n");
+        return 0;
+    }
+
     sc->coll = av_content_light_metadata_alloc(&sc->coll_size);
     if (!sc->coll)
         return AVERROR(ENOMEM);
-- 
2.17.1

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