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avcodec/aacdec_fixed: Fix undefined shift 

Fixes: runtime error: left shift of negative value -801112064
Fixes: 3492/clusterfuzz-testcase-minimized-5784775283441664

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 2017-11-05 21:20:07 +01:00
parent 770c934fa1
commit fca198fb5b
1 changed files with 1 additions and 1 deletions
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libavcodec/aacdec_fixed.c
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@ -309,7 +309,7 @@ static av_always_inline void predict(PredictorState *ps, int *coef,
if (shift > 0) {
*coef += (unsigned)((pv.mant + (1 << (shift - 1))) >> shift);
} else
*coef += (unsigned)(pv.mant << -shift);
*coef += (unsigned)pv.mant << -shift;
}
}