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avcodec/aacdec_fixed: Fix undefined shift in noise_scale()

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Fixes: 13655/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5120559430500352

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 8ea211ab79)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-03-29 08:58:49 +01:00
parent 37b2a19afa
commit 7a5f875e98
1 changed files with 1 additions and 1 deletions
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libavcodec/aacdec_fixed.c
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@ -220,7 +220,7 @@ static void noise_scale(int *coefs, int scale, int band_energy, int len)
} }
else { else {
s = s + 32; s = s + 32;
round = 1 << (s-1); round = s ? 1 << (s-1) : 0;
for (i=0; i<len; i++) { for (i=0; i<len; i++) {
out = (int)((int64_t)((int64_t)coefs[i] * c + round) >> s); out = (int)((int64_t)((int64_t)coefs[i] * c + round) >> s);
coefs[i] = out * ssign; coefs[i] = out * ssign;