Date: Sun, 25 Jul 1999 03:01:31 -0400 (EDT) From: Alexander Litvin <archer@lucky.net> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/12801: nvi infinite recursion with options "leftright" and "comment" Message-ID: <199907250701.DAA89825@unknown.nowhere.org>
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>Number: 12801
>Category: bin
>Synopsis: nvi infinite recursion with options "leftright" and "comment"
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Jul 25 00:10:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Alexander Litvin
>Release: FreeBSD 4.0-CURRENT i386
>Organization:
Lucky Net ltd
>Environment:
FreeBSD unknown.nowhere.org 4.0-CURRENT FreeBSD 4.0-CURRENT #44: Sat Jul 24 13:46:21 EDT 1999 root@unknown.nowhere.org:/usr/src/sys/compile/UNKNOWN i386
(though the release is not relevant because the code in question seem to be
unchanged since 1996)
>Description:
The simultanious usage of the vi editor options 'comment' (skip leading
comments) and 'leftright' (do left-right scrolling) may lead to the
infinite recursion: on src/contrib/nvi/vi/vs_refresh.c:626 vs_paint()
function called recursively from itself. The result is that stack is
exhausted and process receives segfault.
>How-To-Repeat:
1. Create the ${HOME}/.exrc file with two lines:
set leftright
set comment
or, add these lines to the existing .exrc;
2. Open any file with a few shell, C or C++ comment lines in the beginning;
3. Try to open any non-existent (new) file from the same editing session
by invoking ex "edit" command.
>Fix:
The workaround is obviously not use 'comment' and 'leftright' options
simultaniously.
>Release-Note:
>Audit-Trail:
>Unformatted:
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