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Input: gtco - fix endpoint sanity check 

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: 162f98dea4 ("Input: gtco - 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/20191210113737.4016-5-johan@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
alistair/sunxi64-5.5-dsi
Johan Hovold 2020-01-10 12:00:18 -08:00 committed by Dmitry Torokhov
parent cfa4f6a99f
commit a8eeb74df5
1 changed files with 3 additions and 7 deletions
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10
drivers/input/tablet/gtco.c
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@ -875,18 +875,14 @@ static int gtco_probe(struct usb_interface *usbinterface,
}
/* Sanity check that a device has an endpoint */
if (usbinterface->altsetting[0].desc.bNumEndpoints < 1) {
if (usbinterface->cur_altsetting->desc.bNumEndpoints < 1) {
dev_err(&usbinterface->dev,
"Invalid number of endpoints\n");
error = -EINVAL;
goto err_free_urb;
}
/*
* The endpoint is always altsetting 0, we know this since we know
* this device only has one interrupt endpoint
*/
endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
endpoint = &usbinterface->cur_altsetting->endpoint[0].desc;
/* Some debug */
dev_dbg(&usbinterface->dev, "gtco # interfaces: %d\n", usbinterface->num_altsetting);
@ -973,7 +969,7 @@ static int gtco_probe(struct usb_interface *usbinterface,
input_dev->dev.parent = &usbinterface->dev;
/* Setup the URB, it will be posted later on open of input device */
endpoint = &usbinterface->altsetting[0].endpoint[0].desc;
endpoint = &usbinterface->cur_altsetting->endpoint[0].desc;
usb_fill_int_urb(gtco->urbinfo,
udev,