From e41f43a1a675ee6d0f21f2ab611c97ffe9c22088 Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Fri, 21 Aug 2009 21:19:45 +0000
Subject: * fcntl.cc (fcntl64): Detect negative fd as error.

---
 winsup/cygwin/fcntl.cc | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'winsup/cygwin/fcntl.cc')

diff --git a/winsup/cygwin/fcntl.cc b/winsup/cygwin/fcntl.cc
index 442686268..bb41f05c5 100644
--- a/winsup/cygwin/fcntl.cc
+++ b/winsup/cygwin/fcntl.cc
@@ -40,7 +40,13 @@ fcntl64 (int fd, int cmd, ...)
   switch (cmd)
     {
     case F_DUPFD:
-      res = dup2 (fd, cygheap_fdnew (((int) arg) - 1));
+      if ((int) arg >= 0)
+	res = dup2 (fd, cygheap_fdnew (((int) arg) - 1));
+      else
+	{
+	  set_errno (EINVAL);
+	  res = -1;
+	}
       break;
     case F_GETLK:
     case F_SETLK:
-- 
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