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avcodec/qoadec: Fix undefined overflow in lms_predict

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Fixes: signed integer overflow: -1575944192 + -602931200 cannot be represented in type 'int'
Fixes: 62285/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QOA_fuzzer-6470469339185152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2024-03-26 01:58:25 +01:00
parent 48eeb198a5
commit 7eabe56436
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1 changed files with 1 additions and 1 deletions
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libavcodec/qoadec.c
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@ -67,7 +67,7 @@ static int qoa_lms_predict(QOAChannel *lms)
{
int prediction = 0;
for (int i = 0; i < QOA_LMS_LEN; i++)
prediction += lms->weights[i] * lms->history[i];
prediction += (unsigned)lms->weights[i] * lms->history[i];
return prediction >> 13;
}