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avcodec/mvha: Check remaining bits in VLC decode loop

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Fixes: timeout (252sec -> 170msec)
Fixes: 20023/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MVHA_fuzzer-5681192565473280

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 2020-01-15 22:13:14 +01:00
parent a98eeb0c1e
commit cce37a22bc
1 changed files with 2 additions and 0 deletions
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libavcodec/mvha.c
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@ -233,6 +233,8 @@ static int decode_frame(AVCodecContext *avctx,
dst = frame->data[p] + (avctx->height - 1) * frame->linesize[p];
for (int y = 0; y < avctx->height; y++) {
if (get_bits_left(gb) < width)
return AVERROR_INVALIDDATA;
for (int x = 0; x < width; x++) {
int v = get_vlc2(gb, s->vlc.table, s->vlc.bits, 3);