USB: serial: fix minor-number allocation
Due to a missing upper bound, invalid minor numbers could be assigned to
ports. Such devices would later fail to register, but let's catch this
early as intended and avoid having devices with only a subset of their
ports registered (potentially the empty set).
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 7ecf4ff..4d2b310 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -96,7 +96,8 @@
mutex_lock(&table_lock);
for (i = 0; i < num_ports; ++i) {
port = serial->port[i];
- minor = idr_alloc(&serial_minors, port, 0, 0, GFP_KERNEL);
+ minor = idr_alloc(&serial_minors, port, 0,
+ USB_SERIAL_TTY_MINORS, GFP_KERNEL);
if (minor < 0)
goto error;
port->minor = minor;