GNU bug report logs - #56369
29.0.50; abort-redisplay: Crash after 'recenter'

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Florian Rommel <mail <at> florommel.de>
Subject: bug#56369: closed (Re: bug#56369: 29.0.50; abort-redisplay: Crash
 after 'recenter')
Date: Sun, 03 Jul 2022 16:12:02 +0000

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Your bug report

#56369: 29.0.50; abort-redisplay: Crash after 'recenter'

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 56369 <at> debbugs.gnu.org.

-- 
56369: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=56369
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: 56369-done <at> debbugs.gnu.org
Subject: Re: bug#56369: 29.0.50; abort-redisplay: Crash after 'recenter'
Date: Sun, 03 Jul 2022 19:11:09 +0300

Closing.

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From: Florian Rommel <mail <at> florommel.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.50; abort-redisplay: Crash after 'recenter'
Date: Sun, 03 Jul 2022 17:55:50 +0200

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Tags: patch

I get a crash caused by a failed free() [see attached backtrace] when
running vterm [1] which calls 'recenter' from a loaded module.
With gdb, in 'safe_free' I see that the address of the to-be-freed
arguments array (allocated in 'module_funcall') is off by one word.

I don't know the details of the specpdl stack but I assume that there
is a missing 'ubind_to' in 'recenter' before an early return.  When I
add it (see the attached patch) the problem is gone.

[1] https://github.com/akermu/emacs-libvterm

[backtrace.txt (text/plain, attachment)]

[0001-abort-redisplay-Add-missing-unbind_to-in-recenter.patch (text/x-patch, attachment)]

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