[src/trunk]: src/sys/kern protect against NULL, from PaulG

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

details:   https://anonhg.NetBSD.org/src/rev/ab9a4b584d9a
branches:  trunk
changeset: 823861:ab9a4b584d9a
user:      christos <christos%NetBSD.org@localhost>
date:      Thu May 11 23:50:17 2017 +0000

description:
protect against NULL, from PaulG

diffstat:

 sys/kern/kern_event.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (31 lines):

diff -r 2fe96749e8d6 -r ab9a4b584d9a sys/kern/kern_event.c
--- a/sys/kern/kern_event.c     Thu May 11 23:39:15 2017 +0000
+++ b/sys/kern/kern_event.c     Thu May 11 23:50:17 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_event.c,v 1.90 2017/05/09 21:18:51 christos Exp $ */
+/*     $NetBSD: kern_event.c,v 1.91 2017/05/11 23:50:17 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 1.90 2017/05/09 21:18:51 christos Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_event.c,v 1.91 2017/05/11 23:50:17 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1020,9 +1020,10 @@
                        KERNEL_UNLOCK_ONE(NULL);        /* XXXSMP */
                        if (error != 0) {
 #ifdef DIAGNOSTIC
+                               
                                printf("%s: event not supported for file type"
-                                   " %d (error %d)\n", __func__,
-                                   ((file_t *)kn->kn_obj)->f_type, error);
+                                   " %d (error %d)\n", __func__, kn->kn_obj ?
+                                   ((file_t *)kn->kn_obj)->f_type : -1, error);
 #endif
                                /* knote_detach() drops fdp->fd_lock */
                                knote_detach(kn, fdp, false);