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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-07-07 23:16:12 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 12:11:55 +0200 |
| commit | 208055fabf19e1d5e75c47f0a50bb2317beda399 (patch) | |
| tree | 9ecb4349c8b31a1480ba139e642e9ff21f78a04b | |
| parent | 55a510ce328f733dd291833a4c25e161feaad3ae (diff) | |
| download | ffmpeg-208055fabf19e1d5e75c47f0a50bb2317beda399.tar.gz | |
avcodec/vorbisdec: amplitude bits can be more than 25 bits
Fixes: assertion failure, invalid shift
Fixes: 15583/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VORBIS_fuzzer-5640157484548096
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 308771a73870863d1b4f630234fbb5bc7aec8252)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/vorbisdec.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c index 0a5eaa6879..0cb875cbe6 100644 --- a/libavcodec/vorbisdec.c +++ b/libavcodec/vorbisdec.c @@ -1097,13 +1097,14 @@ static int vorbis_floor0_decode(vorbis_context *vc, { vorbis_floor0 *vf = &vfu->t0; float *lsp = vf->lsp; - unsigned amplitude, book_idx; + unsigned book_idx; + uint64_t amplitude; unsigned blockflag = vc->modes[vc->mode_number].blockflag; if (!vf->amplitude_bits) return 1; - amplitude = get_bits(&vc->gb, vf->amplitude_bits); + amplitude = get_bits64(&vc->gb, vf->amplitude_bits); if (amplitude > 0) { float last = 0; unsigned idx, lsp_len = 0; @@ -1181,7 +1182,7 @@ static int vorbis_floor0_decode(vorbis_context *vc, /* calculate linear floor value */ q = exp((((amplitude*vf->amplitude_offset) / - (((1 << vf->amplitude_bits) - 1) * sqrt(p + q))) + (((1ULL << vf->amplitude_bits) - 1) * sqrt(p + q))) - vf->amplitude_offset) * .11512925f); /* fill vector */ |