From cb1b494663e037253337623bf1ef2df727883cb7 Mon Sep 17 00:00:00 2001 From: Johan Hovold <johan@kernel.org> Date: Thu, 16 Mar 2017 11:41:55 -0700 Subject: [PATCH] Input: kbtab - validate number of endpoints before using them Make sure to check the number of endpoints to avoid dereferencing a NULL-pointer should a malicious device lack endpoints. Signed-off-by: Johan Hovold <johan@kernel.org> Cc: stable@vger.kernel.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> --- drivers/input/tablet/kbtab.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c index e850d7e8afbc4..4d9d64908b595 100644 --- a/drivers/input/tablet/kbtab.c +++ b/drivers/input/tablet/kbtab.c @@ -122,6 +122,9 @@ static int kbtab_probe(struct usb_interface *intf, const struct usb_device_id *i struct input_dev *input_dev; int error = -ENOMEM; + if (intf->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + kbtab = kzalloc(sizeof(struct kbtab), GFP_KERNEL); input_dev = input_allocate_device(); if (!kbtab || !input_dev)