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avcodec/aacdec_template: fix integer overflow in imdct_and_windowing()

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Fixes: signed integer overflow: 2147483645 + 4 cannot be represented in type 'int'
Fixes: 15418/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AAC_FIXED_fuzzer-5685269069561856

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 da93e2b14218c4ab0fda60e21882a4633aac5748)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-10 00:04:02 +02:00
parent a1233d39c6
commit 3ee68a677d
1 changed files with 1 additions and 1 deletions
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libavcodec/aacdec_template.c
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@ -2551,7 +2551,7 @@ static void imdct_and_windowing(AACContext *ac, SingleChannelElement *sce)
ac->mdct.imdct_half(&ac->mdct, buf, in);
#if USE_FIXED
for (i=0; i<1024; i++)
buf[i] = (buf[i] + 4) >> 3;
buf[i] = (buf[i] + 4LL) >> 3;
#endif /* USE_FIXED */
}