Index: include/asterisk/select.h
===================================================================
--- include/asterisk/select.h	(revision 310416)
+++ include/asterisk/select.h	(working copy)
@@ -37,8 +37,9 @@
 #if !defined(HAVE_VARIABLE_FDSET) && defined(CONFIGURE_RAN_AS_ROOT)
 #define ast_fdset fd_set
 #else
+#define ast_FDMAX	32768
 typedef struct {
-	TYPEOF_FD_SET_FDS_BITS fds_bits[4096 / SIZEOF_FD_SET_FDS_BITS]; /* 32768 bits */
+	TYPEOF_FD_SET_FDS_BITS fds_bits[ast_FDMAX / 8 / SIZEOF_FD_SET_FDS_BITS]; /* 32768 bits */
 } ast_fdset;
 
 #undef FD_ZERO
Index: main/asterisk.c
===================================================================
--- main/asterisk.c	(revision 310416)
+++ main/asterisk.c	(working copy)
@@ -2932,6 +2932,7 @@
 		fd2 = (l.rlim_cur > sizeof(readers) * 8 ? sizeof(readers) * 8 : l.rlim_cur) - 1;
 		if (dup2(fd, fd2) < 0) {
 			ast_log(LOG_WARNING, "Cannot open maximum file descriptor %d at boot? %s\n", fd2, strerror(errno));
+			close(fd);
 			break;
 		}
 
@@ -2940,9 +2941,12 @@
 		if (ast_select(fd2 + 1, &readers, NULL, NULL, &tv) < 0) {
 			ast_log(LOG_WARNING, "Maximum select()able file descriptor is %d\n", FD_SETSIZE);
 		}
+		ast_FD_SETSIZE = l.rlim_cur > ast_FDMAX ? ast_FDMAX : l.rlim_cur;
+		close(fd);
+		close(fd2);
 	} while (0);
 #elif defined(HAVE_VARIABLE_FDSET)
-	ast_FD_SETSIZE = l.rlim_cur;
+	ast_FD_SETSIZE = l.rlim_cur > ast_FDMAX ? ast_FDMAX : l.rlim_cur;
 #endif /* !defined(CONFIGURE_RAN_AS_ROOT) */
 
 	if ((!rungroup) && !ast_strlen_zero(ast_config_AST_RUN_GROUP))