Commit f1782c9c authored by Josh Boyer's avatar Josh Boyer Committed by Luis Henriques

Input: powermate - fix oops with malicious USB descriptors

commit 9c6ba456 upstream.

The powermate driver expects at least one valid USB endpoint in its
probe function.  If given malicious descriptors that specify 0 for
the number of endpoints, it will crash.  Validate the number of
endpoints on the interface before using them.

The full report for this issue can be found here:
http://seclists.org/bugtraq/2016/Mar/85Reported-by: default avatarRalf Spenneberg <ralf@spenneberg.net>
Signed-off-by: default avatarJosh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Moritz Muehlenhoff <jmm@inutil.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 8b03d908
...@@ -307,6 +307,9 @@ static int powermate_probe(struct usb_interface *intf, const struct usb_device_i ...@@ -307,6 +307,9 @@ static int powermate_probe(struct usb_interface *intf, const struct usb_device_i
int error = -ENOMEM; int error = -ENOMEM;
interface = intf->cur_altsetting; interface = intf->cur_altsetting;
if (interface->desc.bNumEndpoints < 1)
return -EINVAL;
endpoint = &interface->endpoint[0].desc; endpoint = &interface->endpoint[0].desc;
if (!usb_endpoint_is_int_in(endpoint)) if (!usb_endpoint_is_int_in(endpoint))
return -EIO; return -EIO;
......
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