Index: lib/libc_r/uthread/uthread_close.c
===================================================================
RCS file: /big/FreeBSD-CVS/src/lib/libc_r/uthread/uthread_close.c,v
retrieving revision 1.15
diff -u -r1.15 uthread_close.c
--- lib/libc_r/uthread/uthread_close.c	31 May 2003 05:23:20 -0000	1.15
+++ lib/libc_r/uthread/uthread_close.c	9 Jun 2003 09:18:50 -0000
@@ -49,7 +49,8 @@
 	struct stat	sb;
 	struct fd_table_entry	*entry;
 
-	if ((fd == _thread_kern_pipe[0]) || (fd == _thread_kern_pipe[1]) ||
+	if ((fd < 0) || (fd >= _thread_dtablesize) ||
+	    (fd == _thread_kern_pipe[0]) || (fd == _thread_kern_pipe[1]) ||
 	    (_thread_fd_table[fd] == NULL)) {
 		/*
 		 * Don't allow silly programs to close the kernel pipe