Fix overflow in c2i_ASN1_BIT_STRING.
c2i_ASN1_BIT_STRING takes length as a long but uses it as an int. Check bounds before doing so. Previously, excessively large inputs to the function could write a single byte outside the target buffer. (This is unreachable as asn1_ex_c2i already uses int for the length.) Thanks to NCC for finding this issue. Fix written by Martin Kreichgauer. Reviewed-by: NRichard Levitte <levitte@openssl.org> Reviewed-by: NAndy Polyakov <appro@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4385)
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