Fixes: memleak
Fixes: 
29585/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-6594188688490496

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 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index ad0b9a58d3..b754789bcb 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5559,6 +5559,10 @@ static int mov_read_st3d(MOVContext *c, AVIOContext *pb, 
MOVAtom atom)
         av_log(c->fc, AV_LOG_ERROR, "Empty stereoscopic video box\n");
         return AVERROR_INVALIDDATA;
     }
+
+    if (sc->stereo3d)
+        return AVERROR_INVALIDDATA;
+
     avio_skip(pb, 4); /* version + flags */
 
     mode = avio_r8(pb);
-- 
2.17.1

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