Commit 83d920e4 authored Mar 16, 2017 by Johan Hovold Committed by Greg Kroah-Hartman Mar 30, 2017

Input: cm109 - validate number of endpoints before using them



commit ac2ee9ba953afe88f7a673e1c0c839227b1d7891 upstream.

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

Fixes: c04148f9 ("Input: add driver for USB VoIP phones with CM109...")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 9f6a8dca

drivers/input/misc/cm109.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -700,6 +700,10 @@ static int cm109_usb_probe(struct usb_interface *intf,
		int error = -ENOMEM;

		interface = intf->cur_altsetting;

		if (interface->desc.bNumEndpoints < 1)
		return -ENODEV;

		endpoint = &interface->endpoint[0].desc;

		if (!usb_endpoint_is_int_in(endpoint))