--- x/drivers/comedi/drivers/pcl726.c
+++ y/drivers/comedi/drivers/pcl726.c
@@ -316,6 +316,8 @@ static int pcl726_attach(struct comedi_d
 	int ret;
 	int i;
 
+	if (it->options[1] < 0 || it->options[1] > 31)
+		return -EINVAL;
 	ret = comedi_request_region(dev, it->options[0], board->io_len);
 	if (ret)
 		return ret;