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avcodec/alsdec: fix mantisse shift

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Fixes: shift exponent -1 is negative
Fixes: 16039/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5656825657032704

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 02346292a3)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-26 17:07:01 +02:00
parent bfbe5fbda8
commit e4ec2f5ab5
1 changed files with 5 additions and 1 deletions
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6
libavcodec/alsdec.c
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@ -1404,7 +1404,11 @@ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
}
}
mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
if (cutoff_bit_count >= 0) {
mantissa = (unsigned int)(mantissa_temp >> cutoff_bit_count);
} else {
mantissa = (unsigned int)(mantissa_temp <<-cutoff_bit_count);
}
// Need one more shift?
if (mantissa & 0x01000000ul) {