GNU bug report logs - #9948
valgrind warning: Conditional jump or move depends on uninitialised value(s) in redisplay_window

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Package: emacs;

Reported by: Dan Nicolaescu <dann <at> gnu.org>

Date: Thu, 3 Nov 2011 21:58:01 UTC

Severity: minor

Tags: unreproducible

Done: npostavs <at> users.sourceforge.net

Bug is archived. No further changes may be made.

Full log

Message #29 received at 9948 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: 9948 <at> debbugs.gnu.org
Subject: Re: bug#9948: valgrind warning: Conditional jump or move depends
	on uninitialised value(s) in redisplay_window
Date: Mon, 07 Nov 2011 01:30:50 -0500

> Date: Sun, 06 Nov 2011 22:08:54 -0800
> From: Paul Eggert <eggert <at> cs.ucla.edu>
> CC: 9948 <at> debbugs.gnu.org
> 
>   SET_TEXT_POS_FROM_MARKER (startp, w->start);
> 
> does not set startp to a valid charpos if w->start
> points to uninitialized data.

w->startp is the window-start of the window represented by `w'.  It is
a very important player in displaying the window.  If that is
uninitialized, we have a much larger catastrophe on our hands than
some obscure local variable that _could_ be uninitialized ;-)

IOW, if w->startp does not have a valid value, Emacs will crash
pronto.
This bug report was last modified 9 years and 4 days ago.

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