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avcodec/aacdec_fixed: Fix runtime error: shift exponent 34 is too large for 32-bit type 'int'

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Fixes: 1721/clusterfuzz-testcase-minimized-4719352135811072

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 2017-05-21 16:53:55 +02:00
parent efeb47fd5d
commit b5228e44c7
1 changed files with 5 additions and 1 deletions
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6
libavcodec/aacdec_fixed.c
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@ -207,7 +207,11 @@ static void noise_scale(int *coefs, int scale, int band_energy, int len)
c /= band_energy;
s = 21 + nlz - (s >> 2);
if (s > 0) {
if (s > 31) {
for (i=0; i<len; i++) {
coefs[i] = 0;
}
} else if (s > 0) {
round = 1 << (s-1);
for (i=0; i<len; i++) {
out = (int)(((int64_t)coefs[i] * c) >> 32);