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path: root/drivers/char/moxa.c
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Diffstat (limited to 'drivers/char/moxa.c')
-rw-r--r--drivers/char/moxa.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 4a4cab73d0b..65b6ff2442c 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -1184,6 +1184,11 @@ 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;