From: Eli Zaretskii <eliz@gnu.org>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>
Cc: 56108@debbugs.gnu.org
Subject: bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal
Date: Mon, 20 Jun 2022 22:09:59 +0300 [thread overview]
Message-ID: <83mte7kv7c.fsf@gnu.org> (raw)
In-Reply-To: <m235fz5sxw.fsf@Mini.fritz.box> (message from Gerd Möllmann on Mon, 20 Jun 2022 16:07:55 +0200)
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Mon, 20 Jun 2022 16:07:55 +0200
>
> FWIW, here is another non-reproducible crash with ASAN.
>
> In short, shrink_regexp_cache realloc'd something leading to a malloc +
> free, and something is still holding a pointer the old memory. Or so it
> looks to me.
I don't understand why some callers of compile_pattern mark the cache
entry as busy, but some others don't. If a cache entry that is in use
is not marked as busy, then any GC can decide to shrink the cache by
freeing that entry.
next prev parent reply other threads:[~2022-06-20 19:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-20 14:07 bug#56108: 29.0.50; ASAN use-after-free in re_match_2_internal Gerd Möllmann
2022-06-20 19:09 ` Eli Zaretskii [this message]
2022-06-22 8:13 ` Gerd Möllmann
2022-06-22 13:38 ` Eli Zaretskii
2022-06-22 14:10 ` Gerd Möllmann
2022-06-22 14:24 ` Eli Zaretskii
2022-06-22 15:11 ` Gerd Möllmann
2022-06-22 16:19 ` Eli Zaretskii
2022-06-23 5:53 ` Gerd Möllmann
2022-06-23 6:57 ` Eli Zaretskii
2022-06-23 7:17 ` Eli Zaretskii
2022-06-23 21:29 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-06-24 5:55 ` Eli Zaretskii
2022-06-24 6:01 ` Gerd Möllmann
2022-06-24 9:35 ` Gerd Möllmann
2022-06-24 15:40 ` Eli Zaretskii
2022-06-25 9:18 ` Eli Zaretskii
2022-06-27 13:26 ` Eli Zaretskii
2022-06-27 13:29 ` Gerd Möllmann
2022-06-23 8:24 ` Gerd Möllmann
2022-06-23 8:37 ` Eli Zaretskii
2022-06-23 8:49 ` Gerd Möllmann
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