GNU bug report logs - #58042
29.0.50; ASAN use-after-free in re_match_2_internal

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Package: emacs;

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

Date: Sat, 24 Sep 2022 13:46:01 UTC

Severity: normal

Found in version 29.0.50

Fixed in version 29.1

Done: Gerd Möllmann <gerd.moellmann <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: Po Lu <luangruo <at> yahoo.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 58042 <at> debbugs.gnu.org, Alan Third <alan <at> idiocy.org>
Subject: bug#58042: 29.0.50; ASAN use-after-free in re_match_2_internal 
Date: Wed, 05 Oct 2022 13:10:03 +0200

Can somone please help me understand how this works?

Let's say we are in memq called for list L.  Fmemq uses FOR_EACH_TAIL,
which can call maybe_quit, which executes arbitrary Lisp, which can
modify L.  And probably similarly in another 100 places.

I don't get it.
This bug report was last modified 2 years and 73 days ago.

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