Fix cvs signed pointer #609
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get_decode_len may return negative value which leads to huge allocation and denial of service |
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the characters of pointer *p is used as an index to the array cvs_shifts. We control these characters as password and while it seems thats a valid action because cvs_shifts has size of 256, it isn't. The reason is that p is a signed pointer so when p[i](which is say 0xff) will be converted to unsigned size_t as 0xffffffff and not as 255