From 01efaf95b838e30c8325821233149b2c72972216 Mon Sep 17 00:00:00 2001
From: delphij <delphij@FreeBSD.org>
Date: Mon, 5 Mar 2007 03:07:36 +0000
Subject: Avoid infinite recursion on:

  echo "foo foo bar bar bar baz" | sed 's/\([^ ]*\)\( *\1\)*/\1/g'

Obtained from:	OpenBSD via NetBSD (rev. 1.18)
---
 lib/libc/regex/engine.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/libc/regex')

diff --git a/lib/libc/regex/engine.c b/lib/libc/regex/engine.c
index b8c8f49..9c09efa 100644
--- a/lib/libc/regex/engine.c
+++ b/lib/libc/regex/engine.c
@@ -674,6 +674,8 @@ sopno lev;			/* PLUS nesting level */
 			return(NULL);
 		assert(m->pmatch[i].rm_so != -1);
 		len = m->pmatch[i].rm_eo - m->pmatch[i].rm_so;
+		if (len == 0)
+			return(NULL);
 		assert(stop - m->beginp >= len);
 		if (sp > stop - len)
 			return(NULL);	/* not enough left to match */
-- 
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