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avcodec/shorten: Fix a negative left shift in shorten_decode_frame()

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Fixes: left shift of negative value -9057
Fixes: 8527/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5666853924896768

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer
2018-06-05 13:12:54 +02:00
parent d91a0b503d
commit a711efe922
1 changed files with 1 additions and 1 deletions
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libavcodec/shorten.c
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@ -710,7 +710,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
if (s->version < 2) if (s->version < 2)
s->offset[channel][s->nmean - 1] = sum / s->blocksize; s->offset[channel][s->nmean - 1] = sum / s->blocksize;
else else
s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) << s->bitshift; s->offset[channel][s->nmean - 1] = s->bitshift == 32 ? 0 : (sum / s->blocksize) * (1 << s->bitshift);
} }
/* copy wrap samples for use with next block */ /* copy wrap samples for use with next block */