[Libguestfs] [xml] Why does libxml2 limit port numbers to 999, 999, 999?

[Nick Wellnhofer]

On Oct 17, 2020, at 12:24 , Richard W.M. Jones via xml <xml at gnome.org> wrote:
> It seems like libxml2 chose to do this for convenience rather than
> correctness.

Yes, this is an arbitrary limit introduced to avoid integer overflow.
 
> I think it should accept port numbers at least up to
> signed int (the type used to store port numbers), and give an error if
> the port number overflows.

This is fixed now: https://gitlab.gnome.org/GNOME/libxml2/-/commit/b46016b8705b041c0678dd45e445dc73674b75d0

> Also could the uri->port field be changed to unsigned int without
> breaking ABI?

It’s a public struct member, so strictly speaking, no. But the risk to break stuff seems low.

Nick