USB: serial: ti_usb_3410_5052: fix NULL-deref at open

Fix NULL-pointer dereference in open() should a malicious device lack
the expected endpoints:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
..
[<bf06a6b0>] (ti_open [ti_usb_3410_5052]) from [<bf02e118>] (serial_port_activate+0x68/0x98 [usbserial])

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index 8db9d071d940..64b85b8dedf3 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -579,6 +579,13 @@ static int ti_startup(struct usb_serial *serial)
                 goto free_tdev;
         }
 
+        if (serial->num_bulk_in < serial->num_ports ||
+                        serial->num_bulk_out < serial->num_ports) {
+                dev_err(&serial->interface->dev, "missing endpoints\n");
+                status = -ENODEV;
+                goto free_tdev;
+        }
+
         return 0;
 
 free_tdev: