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") Cc: stable stable@vger.kernel.org # 4.4 Cc: Vladis Dronov vdronov@redhat.com Signed-off-by: Johan Hovold johan@kernel.org --- drivers/input/tablet/aiptek.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/input/tablet/aiptek.c b/drivers/input/tablet/aiptek.c index 2ca586fb914f..06d0ffef4a17 100644 --- a/drivers/input/tablet/aiptek.c +++ b/drivers/input/tablet/aiptek.c @@ -1802,14 +1802,14 @@ 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.