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avcodec/rangecoder: Test for invalid corner case

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Fixes runtime error: left shift of 1912602815 by 8 places cannot be represented in type 'int'
Fixes: 1403/clusterfuzz-testcase-minimized-4724820484816896

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-08 02:58:54 +02:00
parent 3a4d387195
commit 5f928c5201
1 changed files with 4 additions and 0 deletions
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libavcodec/rangecoder.c
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@ -58,6 +58,10 @@ av_cold void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf,
c->low = AV_RB16(c->bytestream);
c->bytestream += 2;
if (c->low >= 0xFF00) {
c->low = 0xFF00;
c->bytestream_end = c->bytestream + 2;
}
}
void ff_build_rac_states(RangeCoder *c, int factor, int max_p)