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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-12-08 19:37:46 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-01-11 23:31:18 +0100 |
| commit | c56a52a82c0a4039e606e82b948a8abfe417f35f (patch) | |
| tree | 70ee1344be11ad85a877e598cdf83ac625186335 /libavcodec | |
| parent | 8250bb49b19d50d8c8384ebec79371d59d0ccf21 (diff) | |
| download | ffmpeg-c56a52a82c0a4039e606e82b948a8abfe417f35f.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>
Diffstat (limited to 'libavcodec')
| -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 cc6553165b..c81939c5a7 100644 --- a/libavcodec/vc1dec.c +++ b/libavcodec/vc1dec.c @@ -1033,7 +1033,7 @@ 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; @@ -1107,8 +1107,10 @@ 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; |