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avcodec/shorten: Fix integer overflow in residual/LPC combination

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Fixes: signed integer overflow: -540538872 + -2012739576 cannot be represented in type 'int'
Fixes: 9255/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5758630052757504

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 db7e9082e1a1479c6a8844f7adf77eae03cc2aa7)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-08-12 22:55:59 +02:00
parent 7f480bedd0
commit ec573bd2eb
1 changed files with 1 additions and 1 deletions
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libavcodec/shorten.c
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@ -391,7 +391,7 @@ static int decode_subframe_lpc(ShortenContext *s, int command, int channel,
for (j = 0; j < pred_order; j++)
sum += coeffs[j] * (unsigned)s->decoded[channel][i - j - 1];
s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) +
(sum >> qshift);
(unsigned)(sum >> qshift);
}
/* add offset to current samples */