diff options
| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-08 19:37:46 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-02 19:55:09 +0200 |
| commit | 5e874507e141143cdd7fbc6c09054d5e295369d4 (patch) | |
| tree | d5dcfd52f8d46ea53965e1db86e37e0f41c72705 | |
| parent | b4e369cf36994a6127f2747582f2565116ef8609 (diff) | |
| download | ffmpeg-5e874507e141143cdd7fbc6c09054d5e295369d4.tar.gz | |
avcodec/vc1dec: Limit bits by the actual bitstream size
Fixes: Timeout (350 ->19sec)
Fixes: 19249/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1IMAGE_fuzzer-6566896438870016
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 c56a52a82c0a4039e606e82b948a8abfe417f35f)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vc1dec.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c index 1c9af34368..ca39ceed1d 100644 --- a/libavcodec/vc1dec.c +++ b/libavcodec/vc1dec.c @@ -1012,7 +1012,7 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, ff_mpeg_er_frame_start(s); - v->bits = buf_size * 8; + v->bits = FFMIN(buf_size * 8, s->gb.size_in_bits); v->end_mb_x = s->mb_width; if (v->field_mode) { s->current_picture.f->linesize[0] <<= 1; @@ -1084,8 +1084,10 @@ static int vc1_decode_frame(AVCodecContext *avctx, void *data, continue; } ff_vc1_decode_blocks(v); - if (i != n_slices) + if (i != n_slices) { s->gb = slices[i].gb; + v->bits = FFMIN(buf_size * 8, s->gb.size_in_bits); + } } if (v->field_mode) { v->second_field = 0; |