Is passing an invalid pointer to recv sound?

[Manishearth]

system-interface/src/io/is_read_write.rs

Lines 141 to 152 in 8ee8c82

	// Detect read shutdown. A normal zero-length `recv` does block, so
	// use deliberately invalid pointer, as we get different error codes in
	// the case of a shut-down stream.
	let read_result = unsafe { recv(socket, usize::MAX as *mut _, 1, MSG_PEEK) };
	if read_result == SOCKET_ERROR {
	let err = io::Error::last_os_error();
	match err.raw_os_error() {
	Some(WSAEFAULT) => (),
	Some(WSAESHUTDOWN) => read = false,
	_ => return Err(err),
	}
	}

https://learn.microsoft.com/en-us/windows/win32/api/winsock/nf-winsock-recv doesn't say anything about this, this seems sketchy.