1 files changed, 6 insertions, 1 deletions

diff --git a/lib/libc/net/res_send.c b/lib/libc/net/res_send.c
index 26a0e5172eff..12373d560b7a 100644
--- a/lib/libc/net/res_send.c
+++ b/lib/libc/net/res_send.c
@@ -56,7 +56,7 @@
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)res_send.c	8.1 (Berkeley) 6/4/93";
 static char orig_rcsid[] = "From: Id: res_send.c,v 8.12 1996/10/08 04:51:06 vixie Exp";
-static char rcsid[] = "$Id$";
+static char rcsid[] = "$Id: res_send.c,v 1.13 1997/02/22 15:00:35 peter Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 /*
@@ -574,6 +574,11 @@ read_len:
 			if ((long) timeout.tv_sec <= 0)
 				timeout.tv_sec = 1;
 			timeout.tv_usec = 0;
+			if (s+1 > FD_SETSIZE) {
+				Perror(stderr, "res_send: too many files");
+				res_close();
+				goto next_ns;
+			}
     wait:
 			FD_ZERO(&dsmask);
 			FD_SET(s, &dsmask);