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protect against NULL, from PaulG

This commit is contained in:
christos 2017-05-11 23:50:17 +00:00
parent 0f6453192e
commit f6b964d39b
1 changed files with 5 additions and 4 deletions
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9
sys/kern/kern_event.c
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@ -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 @@ kqueue_register(struct kqueue *kq, struct kevent *kev)
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);