buggy.rs

#[macro_use]
extern crate honggfuzz;

const MIN_LEN: usize = 8000;
const SPECIAL_LOC: usize = MIN_LEN - 200;
const SPECIAL_CHAR: u8 = b'A';

fn parse(s: &str) -> bool {
    if s.len() >= MIN_LEN {
        if s.as_bytes()[SPECIAL_LOC] == SPECIAL_CHAR {
            panic!(); /* BANG! */
        } else {
            true
        }
    } else {
        false
    }
}

fn main() {
    loop {
        fuzz!(|data: &[u8]| {
            if let Ok(s) = std::str::from_utf8(data) {
                let _: bool = parse(s);
            }
        });
    }
}