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Avoid infinite recursion on:

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

From OpenBSD.
This commit is contained in:
christos 2004-04-03 17:00:00 +00:00
parent bcd3f3fcab
commit 46937c5008
1 changed files with 3 additions and 1 deletions
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4
lib/libc/regex/engine.c
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@ -1,4 +1,4 @@
/* $NetBSD: engine.c,v 1.17 2004/03/26 22:42:17 enami Exp $ */
/* $NetBSD: engine.c,v 1.18 2004/04/03 17:00:00 christos Exp $ */
/*-
* Copyright (c) 1992, 1993, 1994
@ -675,6 +675,8 @@ sopno lev; /* PLUS nesting level */
return(NULL);
assert(m->pmatch[i].rm_so != (regoff_t)-1);
len = (size_t)(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 */