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avcodec/apedec: Fix 32bit int overflow in do_apply_filter() 

Fixes: signed integer overflow: 2147480546 + 4096 cannot be represented in type 'int'
Fixes: 16280/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5123442566758400

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-09-02 22:44:50 +02:00
parent 43b3412631
commit 9d3ddef519
1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -1266,7 +1266,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
f->delay - order,
f->adaptcoeffs - order,
order, APESIGN(*data));
res = (res + (1 << (fracbits - 1))) >> fracbits;
res = (int)(res + (1U << (fracbits - 1))) >> fracbits;
res += *data;
*data++ = res;