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avcodec/mpeg4videodec: Clear partitioned frame in decode_studio_vop_header()

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partitioned_frame is also set/cleared in decode_vop_header()

Fixes: out of array read
Fixes: 9789/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-5638681627983872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 074187d599a2ece2bdf77bd08b4b797c5800eda6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-11-04 19:02:55 +01:00
parent 9664c3a4d4
commit 86ba4473fa
1 changed files with 1 additions and 0 deletions
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libavcodec/mpeg4videodec.c
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@ -2967,6 +2967,7 @@ static int decode_studio_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
if (get_bits_left(gb) <= 32)
return 0;
s->partitioned_frame = 0;
s->decode_mb = mpeg4_decode_studio_mb;
decode_smpte_tc(ctx, gb);