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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-12-18 23:05:22 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-12-19 20:07:56 +0100 |
| commit | f1700bd8bb983bb3b56c3a1f8b9078cb62a44f65 (patch) | |
| tree | 9fbbfdab4805b1995c84f2c881f36bcaaeba5921 | |
| parent | 50a92107393113cf0c699877536978adffcc9004 (diff) | |
| download | ffmpeg-f1700bd8bb983bb3b56c3a1f8b9078cb62a44f65.tar.gz | |
avcodec/hevc_ps: check scaling_list_dc_coef
Fixes: signed integer overflow: 2147483640 + 8 cannot be represented in type 'int'
Fixes: 28449/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HEVC_fuzzer-5686013259284480
Reviewed-by: James Almer <jamrial@gmail.com>
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/hevc_ps.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavcodec/hevc_ps.c b/libavcodec/hevc_ps.c index ea6fd536c6..139f3deeda 100644 --- a/libavcodec/hevc_ps.c +++ b/libavcodec/hevc_ps.c @@ -816,7 +816,11 @@ static int scaling_list_data(GetBitContext *gb, AVCodecContext *avctx, ScalingLi next_coef = 8; coef_num = FFMIN(64, 1 << (4 + (size_id << 1))); if (size_id > 1) { - scaling_list_dc_coef[size_id - 2][matrix_id] = get_se_golomb(gb) + 8; + int scaling_list_coeff_minus8 = get_se_golomb(gb); + if (scaling_list_coeff_minus8 < -7 || + scaling_list_coeff_minus8 > 247) + return AVERROR_INVALIDDATA; + scaling_list_dc_coef[size_id - 2][matrix_id] = scaling_list_coeff_minus8 + 8; next_coef = scaling_list_dc_coef[size_id - 2][matrix_id]; sl->sl_dc[size_id - 2][matrix_id] = next_coef; } |