bug#58334: 29.0.50; ASAN heap use after free in gui_produce_glyphs

[Gerd Möllmann]

Po Lu <luangruo@yahoo.com> writes:

> Gerd Möllmann <gerd.moellmann@gmail.com> writes:
>
>> Po Lu, is this also something for Haiku?
>
> Haiku calls Lisp in internal hooks (via safe_call) in
> gui_produce_glyphs.  It does not call redisplay itself in input
> callbacks during normal exxecution.
>
> An exception is made when control over user input is transferred to
> another GUI thread as part of a popup or dialog.  xselect.c and xmenu.c
> do pretty much the same thing.

So it can call redisplay in some cases, and we have to protect against
it?