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Commit d9a3e642 authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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Input: hanwang - validate number of endpoints before using them 



commit ba340d7b83703768ce566f53f857543359aa1b98 upstream.

Make sure to check the number of endpoints to avoid dereferencing a
NULL-pointer should a malicious device lack endpoints.

Fixes: bba5394a ("Input: add support for Hanwang tablets")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1f5a5128

drivers/input/tablet/hanwang.c

+3 −0
Original line number Diff line number Diff line
@@ -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) {