Invalid layout assumptions for std::net::SocketAddrV{4, 6}

[a1phyr]

rio/src/io_uring/uring.rs

Lines 733 to 752 in 319f7fb

	fn addr2raw(
	addr: &std::net::SocketAddr,
	) -> (*const libc::sockaddr, libc::socklen_t) {
	match *addr {
	std::net::SocketAddr::V4(ref a) => {
	let b: *const std::net::SocketAddrV4 = a;
	(
	b as *const _,
	std::mem::size_of_val(a) as libc::socklen_t,
	)
	}
	std::net::SocketAddr::V6(ref a) => {
	let b: *const std::net::SocketAddrV6 = a;
	(
	b as *const _,
	std::mem::size_of_val(a) as libc::socklen_t,
	)
	}
	}
	}

This code assumes that the layout of std::net::SocketAddrV{4,6} matches libc::sockaddr, but std makes no such promise. See rust-lang/rust#78802 for more details.

Example fixes: tokio-rs/mio#1388, rust-lang/socket2#120.