[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#61704: 29.0.60; Crash in get_narrowed_begv
From: |
Eli Zaretskii |
Subject: |
bug#61704: 29.0.60; Crash in get_narrowed_begv |
Date: |
Wed, 22 Feb 2023 14:59:51 +0200 |
> Cc: 61704@debbugs.gnu.org
> Date: Wed, 22 Feb 2023 12:48:02 +0000
> From: Gregory Heytings <gregory@heytings.org>
>
>
> > 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.
I agree that we should understand how this happened (and asked a
similar question), but I installed a defensive protection anyway. It
cannot do any harm.
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Po Lu, 2023/02/22
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Gregory Heytings, 2023/02/22
- bug#61704: 29.0.60; Crash in get_narrowed_begv,
Eli Zaretskii <=
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Gregory Heytings, 2023/02/22
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Eli Zaretskii, 2023/02/22
- bug#61704: 29.0.60; Crash in get_narrowed_begv, martin rudalics, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Po Lu, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, martin rudalics, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Po Lu, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, martin rudalics, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Eli Zaretskii, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Po Lu, 2023/02/23
- bug#61704: 29.0.60; Crash in get_narrowed_begv, Gregory Heytings, 2023/02/23