Panic while decompressing

[frewsxcv]

extern crate brotli;

use std::io::Read;
use brotli::Decompressor;

fn main() {
    let mut input = vec![];
    let _ = Decompressor::new(&b"\x1b\x3f\x00\xff\xff\xb0\xe2\x99\x80\x12".to_vec() as &[u8]).read_to_end(&mut input);
}

coreyf@frewbook-pro /t/meow (master)> cargo run
     Running `target/debug/meow`
thread '<main>' panicked at 'arithmetic operation overflowed', /Users/coreyf/.cargo/git/checkouts/brotli-rs-33811c30552ad7ba/master/src/lib.rs:577
Process didn't exit successfully: `target/debug/meow` (exit code: 101)

Crash discovered using afl.rs