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Extra sanity checks: all char devices won't have an associated tty.

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This commit is contained in:
manu 2003-09-21 18:40:38 +00:00
parent 6c5904f215
commit b01f5cf127
1 changed files with 6 additions and 5 deletions
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11
sys/kern/tty.c
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@ -1,4 +1,4 @@
/* $NetBSD: tty.c,v 1.156 2003/08/11 10:49:06 dsl Exp $ */
/* $NetBSD: tty.c,v 1.157 2003/09/21 18:40:38 manu Exp $ */
/*-
* Copyright (c) 1982, 1986, 1990, 1991, 1993
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.156 2003/08/11 10:49:06 dsl Exp $");
__KERNEL_RCSID(0, "$NetBSD: tty.c,v 1.157 2003/09/21 18:40:38 manu Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1224,10 +1224,11 @@ ttykqfilter(dev_t dev, struct knote *kn)
int s;
const struct cdevsw *cdev;
cdev = cdevsw_lookup(dev);
if (cdev == NULL)
if (((cdev = cdevsw_lookup(dev)) == NULL) ||
(cdev->d_tty == NULL) ||
((tp = (*cdev->d_tty)(dev)) == NULL))
return (ENXIO);
tp = (*cdev->d_tty)(dev);
switch (kn->kn_filter) {
case EVFILT_READ:
klist = &tp->t_rsel.sel_klist;