[FFmpeg-cvslog] avformat/mov: Check for duplicate st3d

[Michael Niedermayer]

ffmpeg | branch: release/4.3 | Michael Niedermayer <michael at niedermayer.cc> | Sun Jan 31 16:28:08 2021 +0100| [6112b1b6e444bbeb6a683b0893a41091492e146c] | committer: Michael Niedermayer

avformat/mov: Check for duplicate st3d

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 <michael at niedermayer.cc>
(cherry picked from commit 658f0606cba0f866714cbe09af30ec40c4168930)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6112b1b6e444bbeb6a683b0893a41091492e146c
---

 libavformat/mov.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 5852355285..697b6908d1 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5518,6 +5518,10 @@ 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);