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| author | Michael Niedermayer <michael@niedermayer.cc> | 2024-09-19 19:43:03 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2024-09-24 15:37:15 +0200 |
| commit | ad35eaf848bb605d9b2b3a638265ac9d385878e3 (patch) | |
| tree | bf78dc37e244dc17abd7f0d9896d451bc089ed4d | |
| parent | f2aba7bd9f26aa7f6c86644ca96bc4698c9f61c2 (diff) | |
| download | ffmpeg-ad35eaf848bb605d9b2b3a638265ac9d385878e3.tar.gz | |
avcodec/osq: Treat sum = 0 as k = 0
We have no valid sample that triggers this so we do not know if this would decode
correctly, but -inf is not the correct k value
Fixes: Assertion n>=0 && n<=32 failed at libavcodec/get_bits.h:423
Fixes: -inf is outside the range of representable values of type 'int'
Fixes: 70709/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_OSQ_fuzzer-6223623839350784
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
| -rw-r--r-- | libavcodec/osq.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libavcodec/osq.c b/libavcodec/osq.c index 4e921896c0..2b75364c18 100644 --- a/libavcodec/osq.c +++ b/libavcodec/osq.c @@ -160,6 +160,8 @@ static int update_residue_parameter(OSQChannel *cb) int rice_k; sum = cb->sum; + if (!sum) + return 0; x = sum / cb->count; rice_k = ceil(log2(x)); if (rice_k >= 30) { |