GNU bug report logs - #58334
29.0.50; ASAN heap use after free in gui_produce_glyphs

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Package: emacs;

Reported by: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Date: Thu, 6 Oct 2022 15:04:01 UTC

Severity: normal

Found in version 29.0.50

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Po Lu <luangruo <at> yahoo.com>
Cc: gerd.moellmann <at> gmail.com, 58334 <at> debbugs.gnu.org
Subject: bug#58334: 29.0.50; ASAN heap use after free in gui_produce_glyphs
Date: Fri, 07 Oct 2022 14:13:30 +0300

> From: Po Lu <luangruo <at> yahoo.com>
> Cc: Eli Zaretskii <eliz <at> gnu.org>,  58334 <at> debbugs.gnu.org
> Date: Fri, 07 Oct 2022 16:36:05 +0800
> 
> Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:
> 
> > And, while vaccuming, I also wondered what happens with the glyph
> > matrices, and maybe other global state?
> 
> Isn't input blocked wherever the glyph matrices are modified?

No, not in general.  Why would it?  We don't allow re-entering
redisplay anyway.

> If not, how come expose_frame always works correctly?

expose_frame doesn't modify glyph matrices, it only uses them,
i.e. accesses them in read-only fashion.  At least AFAIK, that is.
This bug report was last modified 2 years and 311 days ago.

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