A Rust unsafe code auto-translated by C2Rust with memory issue

lib.rs

#![allow ( dead_code )]
#![allow ( mutable_transmutes )]
#![allow ( non_camel_case_types )]
#![allow ( non_snake_case )]
#![allow ( non_upper_case_globals )]
#![allow ( unused_mut )]
extern crate libc;
#[no_mangle]
pub unsafe extern "C" fn insertion_sort(n: libc::c_int, p: *mut libc::c_int)
 -> () {
    let mut i: libc::c_int = 1i32;
    while i <= n {
        let tmp: libc::c_int = *p.offset(i as isize);
        let mut j: libc::c_int = i;
        while j > 0i32 && *p.offset((j - 1i32) as isize) > tmp {
            *p.offset(j as isize) = *p.offset((j - 1i32) as isize);
            j -= 1
        }
        *p.offset(j as isize) = tmp;
        i += 1
    };
}