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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-07-08 01:18:05 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-30 23:55:50 +0200 |
| commit | 07b948fe60789064d7c784d47b8fe798a9a4d2b9 (patch) | |
| tree | c7788fd4d6c6a7362d8eac6283ba7193c1f7ecf3 | |
| parent | 62459d6584ada67b3fb5f38ec86904784c2ab331 (diff) | |
| download | ffmpeg-07b948fe60789064d7c784d47b8fe798a9a4d2b9.tar.gz | |
avcodec/vorbisdec: Check get_vlc2() failure
Fixes: out of array read
Fixes: 16510/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VORBIS_fuzzer-5754510382727168
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/vorbisdec.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c index 1045d574b1..104dc86a13 100644 --- a/libavcodec/vorbisdec.c +++ b/libavcodec/vorbisdec.c @@ -1442,7 +1442,7 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, int vqbook = vr->books[vqclass][pass]; if (vqbook >= 0 && vc->codebooks[vqbook].codevectors) { - unsigned coffs; + int coffs; unsigned dim = vc->codebooks[vqbook].dimensions; unsigned step = FASTDIV(vr->partition_size << 1, dim << 1); vorbis_codebook codebook = vc->codebooks[vqbook]; @@ -1451,14 +1451,20 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, voffs = voffset+j*vlen; for (k = 0; k < step; ++k) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= dim; for (l = 0; l < dim; ++l) vec[voffs + k + l * step] += codebook.codevectors[coffs + l]; } } else if (vr_type == 1) { voffs = voffset + j * vlen; for (k = 0; k < step; ++k) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= dim; for (l = 0; l < dim; ++l, ++voffs) { vec[voffs]+=codebook.codevectors[coffs+l]; @@ -1471,13 +1477,19 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, if (dim == 2) { for (k = 0; k < step; ++k) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 2; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= 2; vec[voffs + k ] += codebook.codevectors[coffs ]; vec[voffs + k + vlen] += codebook.codevectors[coffs + 1]; } } else if (dim == 4) { for (k = 0; k < step; ++k, voffs += 2) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * 4; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= 4; vec[voffs ] += codebook.codevectors[coffs ]; vec[voffs + 1 ] += codebook.codevectors[coffs + 2]; vec[voffs + vlen ] += codebook.codevectors[coffs + 1]; @@ -1485,7 +1497,10 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, } } else for (k = 0; k < step; ++k) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= dim; for (l = 0; l < dim; l += 2, voffs++) { vec[voffs ] += codebook.codevectors[coffs + l ]; vec[voffs + vlen] += codebook.codevectors[coffs + l + 1]; @@ -1502,7 +1517,10 @@ static av_always_inline int vorbis_residue_decode_internal(vorbis_context *vc, unsigned voffs_mod = voffset - voffs_div * ch; for (k = 0; k < step; ++k) { - coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3) * dim; + coffs = get_vlc2(gb, codebook.vlc.table, codebook.nb_bits, 3); + if (coffs < 0) + return coffs; + coffs *= dim; for (l = 0; l < dim; ++l) { vec[voffs_div + voffs_mod * vlen] += codebook.codevectors[coffs + l]; |