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asn1buf_imbed() can perform pointer arithmetic that causes the "bound"
pointer of the subbuffer to be less than the "next" pointer. This can
lead to malloc() failure or crash.
In asn1buf_imbed(), check the length before doing arithmetic to set
subbuf->bound. In asn1buf_remove_octetstring() and
asn1buf_remove_charstring(), check for invalid buffer pointers before
executing an unsigned length check against a (casted to size_t)
Commit By: tlyu