--- linux/fs/fcntl.c
+++ linux/fs/fcntl.c	2002/02/13 20:06:20
@@ -253,7 +253,7 @@
 
 	switch (cmd) {
 		case F_DUPFD:
-			if (arg < NR_OPEN) {
+			if (arg < current->rlim[RLIMIT_NOFILE].rlim_cur) {
 				get_file(filp);
 				err = dupfd(filp, arg);
 			}