OOB Read + Segfault

[sadan4]

use webp::{AnimEncoder, AnimFrame, WebPConfig};

fn main() {
    // Dimensions the encoder is told the frame is.
    let width: u32 = 512;
    let height: u32 = 512;

    // small buffer
    let tiny = vec![0u8; 4];

    let mut config = WebPConfig::new().expect("config");
    config.lossless = 0;
    config.quality = 90.0;

    let mut encoder = AnimEncoder::new(width, height, &config);
    encoder.set_loop_count(0);
    // doesn't check the bounds of `tiny`; assumes its width*height*4 bytes long, which it is not.
    encoder.add_frame(AnimFrame::from_rgba(&tiny, width, height, 0));

    // OOB READ HERE
    let _ = encoder.try_encode().expect("encode");
    unreachable!("OOB read + SIGSEGV before here")
}