Do check for current pointer vs. buffer end before touching any

elements in the buffer.  Fixes an out of bounds access.
From aaron@; OK deraadt@

1 files changed, 2 insertions, 2 deletions

diff --git a/src/lib/libc/net/ns_ntoa.c b/src/lib/libc/net/ns_ntoa.c
index 019e8b0a59..fd67e459da 100644
--- a/src/lib/libc/net/ns_ntoa.c
+++ b/src/lib/libc/net/ns_ntoa.c
@@ -28,7 +28,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: ns_ntoa.c,v 1.12 2003/06/02 20:18:35 millert Exp $";
+static char rcsid[] = "$OpenBSD: ns_ntoa.c,v 1.13 2003/09/25 21:14:46 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -53,7 +53,7 @@ ns_ntoa(struct ns_addr addr)
         cp = spectHex(obuf);
         rem = sizeof(obuf) - (cp - obuf);
         cp2 = cp + 1;
-        while (*up==0 && up < uplim)
+        while (up < uplim && *up==0)
                 up++;
         if (up == uplim) {
                 if (port) {