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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-10-12 16:59:46 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-11-09 15:31:06 +0100 |
| commit | 2a8785966ca18bac2dae6de66df4d92f7f66b6a3 (patch) | |
| tree | 88132260c26b243e64b3b95186b1e76aa56c8954 /libavcodec | |
| parent | 947732c56d56a567f051cfd8219678372230ce70 (diff) | |
| download | ffmpeg-2a8785966ca18bac2dae6de66df4d92f7f66b6a3.tar.gz | |
avcodec/vc1_block: Check input in the block decode loops
Fixes: Timeout (196sec -> 2sec)
Fixes: 18026/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VC1_fuzzer-5640941108461568
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/vc1_block.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c index ca793a7992..fe6b06ff51 100644 --- a/libavcodec/vc1_block.c +++ b/libavcodec/vc1_block.c @@ -2728,6 +2728,11 @@ static int vc1_decode_i_blocks_adv(VC1Context *v) // do actual MB decoding and displaying if (v->fieldtx_is_raw) v->fieldtx_plane[mb_pos] = get_bits1(&v->s.gb); + if (get_bits_left(&v->s.gb) <= 1) { + ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR); + return 0; + } + cbp = get_vlc2(&v->s.gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2); if (v->acpred_is_raw) v->s.ac_pred = get_bits1(&v->s.gb); @@ -2838,6 +2843,12 @@ static void vc1_decode_p_blocks(VC1Context *v) for (; s->mb_x < s->mb_width; s->mb_x++) { ff_update_block_index(s); + if (v->fcm == ILACE_FIELD || (v->fcm == PROGRESSIVE && v->mv_type_is_raw) || v->skip_is_raw) + if (get_bits_left(&v->s.gb) <= 1) { + ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR); + return; + } + if (v->fcm == ILACE_FIELD) { vc1_decode_p_mb_intfi(v); if (apply_loop_filter) @@ -2921,6 +2932,12 @@ static void vc1_decode_b_blocks(VC1Context *v) for (; s->mb_x < s->mb_width; s->mb_x++) { ff_update_block_index(s); + if (v->fcm == ILACE_FIELD || v->skip_is_raw || v->dmb_is_raw) + if (get_bits_left(&v->s.gb) <= 1) { + ff_er_add_slice(&s->er, 0, s->start_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR); + return; + } + if (v->fcm == ILACE_FIELD) { vc1_decode_b_mb_intfi(v); if (v->s.loop_filter) |