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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> (cherry picked from commit b880b3b236ddd00f85ea502b4c17a145fd26c790) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -1416,7 +1416,7 @@ static SoftFloat_IEEE754 multiply(SoftFloat_IEEE754 a, SoftFloat_IEEE754 b) {
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return_val = 0x80000000U;
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}
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return_val |= (a.exp + b.exp + bit_count - 47) << 23;
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return_val |= ((unsigned)av_clip(a.exp + b.exp + bit_count - 47, -126, 127) << 23) & 0x7F800000;
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return_val |= mantissa;
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return av_bits2sf_ieee754(return_val);
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}
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