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avcodec/apedec: Fixes integer overflow of res+*data in do_apply_filter()

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Fixes: signed integer overflow: 7400 + 2147482786 cannot be represented in type 'int'
Fixes: 18405/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5708834760294400

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 dc3f327e7403a34c88a900f0b8de55b4afd7cf6c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-29 18:30:07 +01:00
parent 17d5c21b3d
commit 6b430f066b
1 changed files with 1 additions and 1 deletions
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libavcodec/apedec.c
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@ -1268,7 +1268,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
f->adaptcoeffs - order,
order, APESIGN(*data));
res = (int)(res + (1U << (fracbits - 1))) >> fracbits;
res += *data;
res += (unsigned)*data;
*data++ = res;
/* Update the output history */