USB: ftdi_sio: fix null deref at port probe

commit aea1ae8760314e072bf1b773521e9de5d5dda10d upstream.

Fix NULL-pointer dereference when probing an interface with no
endpoints.

These devices have two bulk endpoints per interface, but this avoids
crashing the kernel if a user forces a non-FTDI device to be probed.

Note that the iterator variable was made unsigned in order to avoid
a maybe-uninitialized compiler warning for ep_desc after the loop.

Fixes: 895f28badce9 ("USB: ftdi_sio: fix hi-speed device packet size
calculation")

Reported-by: Mike Remski <mremski@mutualink.net>
Tested-by: Mike Remski <mremski@mutualink.net>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index edf3b12..115662c 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1566,14 +1566,17 @@ static void ftdi_set_max_packet_size(struct usb_serial_port *port)
        struct usb_device *udev = serial->dev;
 
        struct usb_interface *interface = serial->interface;
-       struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
+       struct usb_endpoint_descriptor *ep_desc;
 
        unsigned num_endpoints;
-       int i;
+       unsigned i;
 
        num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
        dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
 
+       if (!num_endpoints)
+               return;
+
        /* NOTE: some customers have programmed FT232R/FT245R devices
         * with an endpoint size of 0 - not good.  In this case, we
         * want to override the endpoint descriptor setting and use a