[FFmpeg-cvslog] avcodec/mpeg4videodec: Clear interlaced_dct for studio profile

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Fri Feb 15 01:57:09 2019 +0100| [8066cb3556e77570b72b28ccef9613ea0887d5ac] | committer: Michael Niedermayer

avcodec/mpeg4videodec: Clear interlaced_dct for studio profile

Fixes: Out of array access
Fixes: 13090/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5408668986638336

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Kieran Kunhya <kierank at obe.tv>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 1f686d023b95219db933394a7704ad9aa5f01cbb)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8066cb3556e77570b72b28ccef9613ea0887d5ac
---

 libavcodec/mpeg4videodec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index f44ee76bd4..ecd028a87c 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -3057,6 +3057,7 @@ static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         return 0;
 
     s->partitioned_frame = 0;
+    s->interlaced_dct = 0;
     s->decode_mb = mpeg4_decode_studio_mb;
 
     decode_smpte_tc(ctx, gb);