USB: usbmon: fix bug in mon_buff_area_shrink

[safe/jmp/linux-2.6] / drivers / char / moxa.c

diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 4a4cab7..dd0083b 100644 (file)
--- 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;