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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.





  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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