yann@1201: Original patch from: gentoo/src/patchsets/glibc/2.9/0053_all_glibc-2.9-regex-BZ697.patch
yann@1201: 
yann@1201: -= BEGIN original header =-
yann@1201: http://sourceware.org/ml/libc-alpha/2009-01/msg00006.html
yann@1201: 
yann@1201: From 37bdc055ceeb6b1144c07448a7210d9ab3fbb2f5 Mon Sep 17 00:00:00 2001
yann@1201: From: Ulrich Drepper <drepper@redhat.com>
yann@1201: Date: Thu, 8 Jan 2009 00:47:05 +0000
yann@1201: Subject: [PATCH] (prune_impossible_nodes): Handle sifted_states[0] being NULL also if
yann@1201:  there are no backreferences.
yann@1201: 
yann@1201: -= END original header =-
yann@1201: 
yann@1201: diff -durN glibc-2_9.orig/posix/regexec.c glibc-2_9/posix/regexec.c
yann@1201: --- glibc-2_9.orig/posix/regexec.c	2007-10-12 19:47:13.000000000 +0200
yann@1201: +++ glibc-2_9/posix/regexec.c	2009-02-02 22:00:43.000000000 +0100
yann@1201: @@ -1004,6 +1004,11 @@
yann@1201:        re_node_set_free (&sctx.limits);
yann@1201:        if (BE (ret != REG_NOERROR, 0))
yann@1201:  	goto free_return;
yann@1201: +      if (sifted_states[0] == NULL)
yann@1201: +	{
yann@1201: +	  ret = REG_NOMATCH;
yann@1201: +	  goto free_return;
yann@1201: +	}
yann@1201:      }
yann@1201:    re_free (mctx->state_log);
yann@1201:    mctx->state_log = sifted_states;