possible segmentation fault

[charlesxsh]

Hi there, due to public new function available for type, there is an potential segmentation fault chance without any unsafe involved.

fn main() {
    let a = pkcs11::types::CK_ATTRIBUTE::new(123);
    a.get_bool(); // get_bool can also be replaced with any member functions contains dereference operation without check pointer is null 
}

cargo run

Segmentation fault

[mheese]

@charlesxsh please switch to using the cryptoki crate https://github.com/parallaxsecond/rust-cryptoki . I'm no longer maintaining this reop.