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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@obe.tv>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-02-15 01:57:09 +01:00
parent d6fc5dc24a
commit 1f686d023b
1 changed files with 1 additions and 0 deletions
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libavcodec/mpeg4videodec.c
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@ -3057,6 +3057,7 @@ static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
return 0; return 0;
s->partitioned_frame = 0; s->partitioned_frame = 0;
s->interlaced_dct = 0;
s->decode_mb = mpeg4_decode_studio_mb; s->decode_mb = mpeg4_decode_studio_mb;
decode_smpte_tc(ctx, gb); decode_smpte_tc(ctx, gb);