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avcodec/alsdec: fix undefined shift in multiply() 

Fixes: left shift of negative value -6
Fixes: 15564/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5701655938465792

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-07 00:03:51 +02:00
parent 9cd0d94f59
commit b880b3b236
1 changed files with 1 additions and 1 deletions
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2
libavcodec/alsdec.c
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@ -1416,7 +1416,7 @@ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
return_val = 0x80000000U;
}
return_val |= (a.exp + b.exp + bit_count - 47) << 23;
return_val |= ((unsigned)av_clip(a.exp + b.exp + bit_count - 47, -126, 127) << 23) & 0x7F800000;
return_val |= mantissa;
return av_bits2sf_ieee754(return_val);
}