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avcodec/vc1dec: Clear block_index in vc1_decode_reset()

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Fixes: 377965565/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-4504434689769472
Fixes: out of array access

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2024-12-01 23:30:55 +01:00
parent 3f029bfb7f
commit 251de1791e
1 changed files with 1 additions and 0 deletions
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libavcodec/vc1dec.c
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@@ -788,6 +788,7 @@ static av_cold void vc1_decode_reset(AVCodecContext *avctx)
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
av_freep(&v->sr_rows[i >> 1][i & 1]); av_freep(&v->sr_rows[i >> 1][i & 1]);
ff_mpv_common_end(&v->s); ff_mpv_common_end(&v->s);
memset(v->s.block_index, 0, sizeof(v->s.block_index));
av_freep(&v->mv_type_mb_plane); av_freep(&v->mv_type_mb_plane);
av_freep(&v->direct_mb_plane); av_freep(&v->direct_mb_plane);
av_freep(&v->forward_mb_plane); av_freep(&v->forward_mb_plane);