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avcodec/lagarith: Fix runtime error: left shift of negative value -1

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Fixes: 1424/clusterfuzz-testcase-minimized-6088327159611392

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ddb2dd7edbccc5596d8e3c039133be8444cb1d02)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-10 00:50:05 +02:00
parent 0fed5947bd
commit c1a6521df8
1 changed files with 1 additions and 1 deletions
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libavcodec/lagarith.c
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@ -98,7 +98,7 @@ static uint32_t softfloat_mul(uint32_t x, uint64_t mantissa)
static uint8_t lag_calc_zero_run(int8_t x)
{
return (x << 1) ^ (x >> 7);
return (x * 2) ^ (x >> 7);
}
static int lag_decode_prob(GetBitContext *gb, uint32_t *value)