diff options
| -rw-r--r-- | sys/dev/cons.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/sys/dev/cons.c b/sys/dev/cons.c index 4cd2c5b558d..f2a017da15a 100644 --- a/sys/dev/cons.c +++ b/sys/dev/cons.c @@ -1,4 +1,4 @@ -/* $OpenBSD: cons.c,v 1.7 1996/04/21 22:19:48 deraadt Exp $ */ +/* $OpenBSD: cons.c,v 1.8 2001/02/09 20:48:24 mickey Exp $ */ /* $NetBSD: cons.c,v 1.30 1996/04/08 19:57:30 jonathan Exp $ */ /* @@ -66,6 +66,7 @@ cnopen(dev, flag, mode, p) int flag, mode; struct proc *p; { + dev_t cndev; if (cn_tab == NULL) return (0); @@ -75,12 +76,18 @@ cnopen(dev, flag, mode, p) * later. This follows normal device semantics; they always get * open() calls. */ - dev = cn_tab->cn_dev; + cndev = cn_tab->cn_dev; + if (cndev == NODEV) + return (ENXIO); +#ifdef DIAGNOSTIC + if (cndev == dev) + panic("cnopen: recursive"); +#endif if (cn_devvp == NULLVP) { /* try to get a reference on its vnode, but fail silently */ - cdevvp(dev, &cn_devvp); + cdevvp(cndev, &cn_devvp); } - return ((*cdevsw[major(dev)].d_open)(dev, flag, mode, p)); + return ((*cdevsw[major(cndev)].d_open)(cndev, flag, mode, p)); } int |