[src/trunk]: src/sys/kern make sure we cleanup properly when fd is too big.

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/8be5f0720500
branches:  trunk
changeset: 346479:8be5f0720500
user:      christos <christos%NetBSD.org@localhost>
date:      Thu Jul 14 18:16:51 2016 +0000

description:
make sure we cleanup properly when fd is too big.

diffstat:

 sys/kern/kern_event.c |  10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diffs (31 lines):

diff -r 75bbeb84318f -r 8be5f0720500 sys/kern/kern_event.c
--- a/sys/kern/kern_event.c     Thu Jul 14 17:43:48 2016 +0000
+++ b/sys/kern/kern_event.c     Thu Jul 14 18:16:51 2016 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_event.c,v 1.87 2016/07/14 06:22:17 christos Exp $ */
+/*     $NetBSD: kern_event.c,v 1.88 2016/07/14 18:16:51 christos Exp $ */
 
 /*-
  * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc.
@@ -58,7 +58,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_event.c,v 1.87 2016/07/14 06:22:17 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_event.c,v 1.88 2016/07/14 18:16:51 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -936,10 +936,8 @@
        if (kfilter->filtops->f_isfd) {
                /* monitoring a file descriptor */
                /* validate descriptor */
-               if (kev->ident > INT_MAX)
-                       return EBADF;
-               fd = kev->ident;
-               if ((fp = fd_getfile(fd)) == NULL) {
+               if (kev->ident > INT_MAX
+                   || (fp = fd_getfile(fd = kev->ident)) == NULL) {
                        rw_exit(&kqueue_filter_lock);
                        kmem_free(newkn, sizeof(*newkn));
                        return EBADF;