Panic when using read_box

[frewsxcv]

extern crate mp4parse;

use std::io::Cursor;

fn main() {
    let mut c = Cursor::new(b"\x00\x00\x00\x04\xa6\x00\x04\xa6".to_vec());
    let mut context = mp4parse::MediaContext::new();
    let _ = mp4parse::read_box(&mut c, &mut context);
}

coreyf@frewbook-pro /t/mp4 (master) [101]> cargo run
   Compiling mp4 v0.1.0 (file:///private/tmp/mp4)
     Running `target/debug/mp4`
thread '<main>' panicked at 'invalid box size', /private/tmp/mp4parse-rust/src/lib.rs:233
Process didn't exit successfully: `target/debug/mp4` (exit code: 101)

panic discovered using afl.rs

[rillian]

Thanks for fuzzing! Can you please attach the test case so we can verify fixes?

[frewsxcv]

The test case is in the first codeblock in my original post, unless you're talking about something else?

[rillian]

Oh, right. Sorry, didn't expect the test to be so short!

[rillian]

Fixed in 9eca3e7. I also included your testcase as a regression test in e97cf8a. Hope that's ok with you, @frewsxcv?

[frewsxcv]

Sounds great! Should I continue to fuzz or is the project not ready for it yet?

[rillian]

Fuzzing it welcome. We can find some of these panic!s with valid files, but this is more general.