Input: aiptek - fix endpoint sanity check

BugLink: https://bugs.launchpad.net/bugs/1864261
commit 3111491fca4f01764e0c158c5e0f7ced808eef51 upstream.

The driver was checking the number of endpoints of the first alternate
setting instead of the current one, something which could lead to the
driver binding to an invalid interface.

This in turn could cause the driver to misbehave or trigger a WARN() in
usb_submit_urb() that kernels with panic_on_warn set would choke on.

Fixes: 8e20cf2bce12 ("Input: aiptek - fix crash on detecting device without endpoints")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Vladis Dronov <vdronov@redhat.com>
Link: https://lore.kernel.org/r/20191210113737.4016-3-johan@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c
index 0b55e1f375b397627915790e1876a509ae1d5276..fbe2df91aad3a3957a0bbb94175a7617be5ff7f4 100644 (file)
--- a/drivers/input/tablet/aiptek.c
+++ b/drivers/input/tablet/aiptek.c
@@ -1822,14 +1822,14 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
        input_set_abs_params(inputdev, ABS_WHEEL, AIPTEK_WHEEL_MIN, AIPTEK_WHEEL_MAX - 1, 0, 0);
 
        /* Verify that a device really has an endpoint */
-       if (intf->altsetting[0].desc.bNumEndpoints < 1) {
+       if (intf->cur_altsetting->desc.bNumEndpoints < 1) {
                dev_err(&intf->dev,
                        "interface has %d endpoints, but must have minimum 1\n",
-                       intf->altsetting[0].desc.bNumEndpoints);
+                       intf->cur_altsetting->desc.bNumEndpoints);
                err = -EINVAL;
                goto fail3;
        }
-       endpoint = &intf->altsetting[0].endpoint[0].desc;
+       endpoint = &intf->cur_altsetting->endpoint[0].desc;
 
        /* Go set up our URB, which is called when the tablet receives
         * input.