From ba340d7b83703768ce566f53f857543359aa1b98 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Thu, 16 Mar 2017 11:39:29 -0700 Subject: [PATCH] Input: hanwang - 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. Fixes: bba5394ad3bd ("Input: add support for Hanwang tablets") Signed-off-by: Johan Hovold Cc: stable@vger.kernel.org # 2.6.37 Signed-off-by: Dmitry Torokhov --- drivers/input/tablet/hanwang.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/input/tablet/hanwang.c b/drivers/input/tablet/hanwang.c index cd852059b99e..df4bea96d7ed 100644 --- a/drivers/input/tablet/hanwang.c +++ b/drivers/input/tablet/hanwang.c @@ -340,6 +340,9 @@ static int hanwang_probe(struct usb_interface *intf, const struct usb_device_id int error; int i; + if (intf->cur_altsetting->desc.bNumEndpoints < 1) + return -ENODEV; + hanwang = kzalloc(sizeof(struct hanwang), GFP_KERNEL); input_dev = input_allocate_device(); if (!hanwang || !input_dev) { -- 2.20.1