[PATCH 3.16.y-ckt 02/17] Input: powermate - fix oops with malicious USB descriptors

From: Luis Henriques
Date: Tue Apr 12 2016 - 14:12:24 EST


3.16.7-ckt27 -stable review patch. If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>

commit 9c6ba456711687b794dcf285856fc14e2c76074f 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/85

Reported-by: Ralf Spenneberg <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Josh Boyer <jwboyer@xxxxxxxxxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: Moritz Muehlenhoff <jmm@xxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/input/misc/powermate.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/input/misc/powermate.c b/drivers/input/misc/powermate.c
index 63b539d3daba..84909a12ff36 100644
--- a/drivers/input/misc/powermate.c
+++ b/drivers/input/misc/powermate.c
@@ -307,6 +307,9 @@ static int powermate_probe(struct usb_interface *intf, const struct usb_device_i
int error = -ENOMEM;

interface = intf->cur_altsetting;
+ if (interface->desc.bNumEndpoints < 1)
+ return -EINVAL;
+
endpoint = &interface->endpoint[0].desc;
if (!usb_endpoint_is_int_in(endpoint))
return -EIO;