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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-06-19 01:04:07 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-07-08 08:27:18 +0200 |
| commit | a6474b899c1153e3bb95e399b6605c3507aea0d0 (patch) | |
| tree | 9e602c6ad700552258313c76d454ba5f7a9a23c4 /libavcodec/alac.c | |
| parent | e96b7a8ba62c5e010328b80b647b64dd9cdbdc01 (diff) | |
| download | ffmpeg-a6474b899c1153e3bb95e399b6605c3507aea0d0.tar.gz | |
avcodec/alac: Check lpc_quant
lpc_quant of 0 produces undefined behavior, thus disallow this.
If valid samples use this then such a sample would be quite
usefull to confirm the correct&lossles handling of this.
Fixes: libavcodec/alac.c:218:25: runtime error: shift exponent -1 is negative
Fixes: 15273/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5656388535058432
Fixes: 15276/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5761238417539072
Fixes: 15315/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALAC_fuzzer-5767260766994432
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/alac.c')
| -rw-r--r-- | libavcodec/alac.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/alac.c b/libavcodec/alac.c index 2f44340661..c234d7153b 100644 --- a/libavcodec/alac.c +++ b/libavcodec/alac.c @@ -306,7 +306,7 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index, rice_history_mult[ch] = get_bits(&alac->gb, 3); lpc_order[ch] = get_bits(&alac->gb, 5); - if (lpc_order[ch] >= alac->max_samples_per_frame) + if (lpc_order[ch] >= alac->max_samples_per_frame || !lpc_quant[ch]) return AVERROR_INVALIDDATA; /* read the predictor table */ |