From: Gregory Heytings <gregory@heytings.org>
To: Po Lu <luangruo@yahoo.com>
Cc: 61704@debbugs.gnu.org
Subject: bug#61704: 29.0.60; Crash in get_narrowed_begv
Date: Wed, 22 Feb 2023 12:48:02 +0000 [thread overview]
Message-ID: <e737b605e9c064e56128@heytings.org> (raw)
In-Reply-To: <874jrdq4ct.fsf@po-lus-librem-15.mail-host-address-is-not-set>
>
> The cause is an arithmetic trap in get_narrowed_begv:
>
> return max ((pos / len - 1) * len, BEGV);
>
> where len is 0. The window was previously being resized, and has a
> pixel width of 24.
>
How can len possibly be 0 at that point? It is (in short)
window_body_width (w, WINDOW_BODY_IN_CANONICAL_CHARS) * window_body_height
(w, WINDOW_BODY_IN_CANONICAL_CHARS). We could add a condition in
get_narrowed_len to return 1 when the result is 0, but it could be a bug
somewhere else (can a window body have a zero width and/or height?), in
which case it would be better to fix the bug there.
next prev parent reply other threads:[~2023-02-22 12:48 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <874jrdq4ct.fsf.ref@po-lus-librem-15.mail-host-address-is-not-set>
2023-02-22 12:20 ` bug#61704: 29.0.60; Crash in get_narrowed_begv Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-22 12:48 ` Gregory Heytings [this message]
2023-02-22 12:59 ` Eli Zaretskii
2023-02-22 13:16 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-22 13:40 ` Gregory Heytings
2023-02-22 13:47 ` Eli Zaretskii
2023-02-22 14:12 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-22 14:18 ` Gregory Heytings
2023-02-22 13:17 ` Gregory Heytings
2023-02-22 13:44 ` Eli Zaretskii
2023-02-23 9:33 ` martin rudalics
2023-02-23 9:37 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-23 9:46 ` martin rudalics
2023-02-23 13:07 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-23 15:28 ` martin rudalics
2023-02-23 10:51 ` Eli Zaretskii
2023-02-23 13:08 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-23 10:54 ` Gregory Heytings
2023-02-23 13:11 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2023-02-23 13:23 ` Gregory Heytings
2023-02-23 15:28 ` martin rudalics
2023-02-23 15:54 ` Gregory Heytings
2023-02-23 17:41 ` martin rudalics
2023-02-23 10:44 ` Eli Zaretskii
2023-02-23 15:27 ` martin rudalics
2023-02-22 12:57 ` Eli Zaretskii
2023-02-22 13:23 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
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