From d71805725f122d647ce68576eb03db8308bcefa4 Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Thu, 18 Aug 2005 08:35:19 +0000
Subject: [PATCH] 	* errno.cc (strerror): Check errnum for underflow.

---
 winsup/cygwin/ChangeLog | 4 ++++
 winsup/cygwin/errno.cc  | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 77ca68274..1e14b73a7 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,7 @@
+2005-08-18  Corinna Vinschen  <corinna@vinschen.de>
+
+	* errno.cc (strerror): Check errnum for underflow.
+
 2005-08-17  Christopher Faylor  <cgf@timesys.com>
 
 	* dcrt0.cc (dll_crt0_1): Tweak debugging stuff.
diff --git a/winsup/cygwin/errno.cc b/winsup/cygwin/errno.cc
index d8af29de6..8b84fb8ca 100644
--- a/winsup/cygwin/errno.cc
+++ b/winsup/cygwin/errno.cc
@@ -330,7 +330,7 @@ extern "C" char *
 strerror (int errnum)
 {
   const char *error;
-  if (errnum < _sys_nerr)
+  if (errnum >= 0 && errnum < _sys_nerr)
     error = _sys_errlist [errnum];
   else
     {