diff options
Diffstat (limited to 'sys/kern/tty_pty.c')
| -rw-r--r-- | sys/kern/tty_pty.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c index 155b046..c861d40 100644 --- a/sys/kern/tty_pty.c +++ b/sys/kern/tty_pty.c @@ -196,6 +196,12 @@ ptsopen(struct cdev *dev, int flag, int devtype, struct thread *td) return(ENXIO); pt = dev->si_drv1; tp = dev->si_tty; + + /* XXX It can happen that devfs_open calls us with tp->t_refcnt == 0 */ + if (tp == NULL || tp->t_refcnt == 0) { + return (ENXIO); + } + if ((tp->t_state & TS_ISOPEN) == 0) { ttyinitmode(tp, 1, 0); } else if (tp->t_state & TS_XCLUDE && suser(td)) @@ -314,6 +320,12 @@ ptcopen(struct cdev *dev, int flag, int devtype, struct thread *td) if (!dev->si_drv1) return(ENXIO); tp = dev->si_tty; + + /* XXX It can happen that devfs_open calls us with tp->t_refcnt == 0 */ + if (tp == NULL || tp->t_refcnt == 0) { + return (ENXIO); + } + if (tp->t_oproc) return (EIO); tp->t_timeout = -1; |
