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avcodec/osq: Treat sum = 0 as k = 0

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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
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Michael Niedermayer 2024-09-19 19:43:03 +02:00
parent f2aba7bd9f
commit ad35eaf848
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libavcodec/osq.c
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@ -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) {