diff options
Diffstat (limited to 'drivers/char/moxa.c')
| -rw-r--r-- | drivers/char/moxa.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c index 4a4cab73d0b..dd0083bbb64 100644 --- a/drivers/char/moxa.c +++ b/drivers/char/moxa.c @@ -34,6 +34,7 @@ #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/major.h> +#include <linux/smp_lock.h> #include <linux/string.h> #include <linux/fcntl.h> #include <linux/ptrace.h> @@ -1184,6 +1185,11 @@ static int moxa_open(struct tty_struct *tty, struct file *filp) return -ENODEV; } + if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) { + mutex_unlock(&moxa_openlock); + return -ENODEV; + } + ch = &brd->ports[port % MAX_PORTS_PER_BOARD]; ch->port.count++; tty->driver_data = ch; |