GNU bug report logs - #29506
find-composition segfaults

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Package: emacs;

Reported by: Edgard Bikelis <bikelis <at> gmail.com>

Date: Thu, 30 Nov 2017 06:45:03 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Message #13 received at 29506-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Edgard Bikelis <bikelis <at> gmail.com>
Cc: 29506-done <at> debbugs.gnu.org
Subject: Re: bug#29506: find-composition segfaults
Date: Thu, 30 Nov 2017 20:02:36 +0200

> From: Edgard Bikelis <bikelis <at> gmail.com>
> Date: Thu, 30 Nov 2017 03:52:57 -0200
> 
> I was testing decomposing some characters in malayalam, and by evaluating this:
> 
> (find-composition 0 1 "ദേ")
> 
> emacs segfaults when it’s in gui mode, but not when it’s on the
> console, with the -nw option. I have asked on #emacs on freenode, and
> other people had the same effect on version 25.2 and 26. It seems to
> happen with unicode past some high number, it doesn’t happen with "á"
> for instance, with a+ combining acute above, but it does happen in
> Arabic also, like with "ڜ".

More accurately, it aborts or segfaults for any string with characters
that are not supported by the default face's font.  On a TTY, fonts
are never an issue, so it never crashes there.

I fixed this now for Emacs 26, thanks for reporting this issue.
This bug report was last modified 7 years and 231 days ago.

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