From: Oliver Neukum Date: Thu, 1 Aug 2019 16:44:25 +0000 (-0700) Subject: Input: kbtab - sanity check for endpoint type X-Git-Tag: v4.4.190~38 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be5ec202e7a062007bc09c2368b6bf5f1277d35f;p=thirdparty%2Fkernel%2Fstable.git Input: kbtab - sanity check for endpoint type commit c88090dfc84254fa149174eb3e6a8458de1912c4 upstream. The driver should check whether the endpoint it uses has the correct type. Reported-by: syzbot+c7df50363aaff50aa363@syzkaller.appspotmail.com Signed-off-by: Oliver Neukum Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c index 2812f9236b7d0..0ccc120a0f145 100644 --- a/drivers/input/tablet/kbtab.c +++ b/drivers/input/tablet/kbtab.c @@ -125,6 +125,10 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i if (intf->cur_altsetting->desc.bNumEndpoints < 1) return -ENODEV; + endpoint = &intf->cur_altsetting->endpoint[0].desc; + if (!usb_endpoint_is_int_in(endpoint)) + return -ENODEV; + kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); input_dev = input_allocate_device(); if (!kbtab || !input_dev) @@ -164,8 +168,6 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i input_set_abs_params(input_dev, ABS_Y, 0, 0x1750, 4, 0); input_set_abs_params(input_dev, ABS_PRESSURE, 0, 0xff, 0, 0); - endpoint = &intf->cur_altsetting->endpoint[0].desc; - usb_fill_int_urb(kbtab->irq, dev, usb_rcvintpipe(dev, endpoint->bEndpointAddress), kbtab->data, 8,