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Input: cm109 - 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: c04148f915 ("Input: add driver for USB VoIP phones with CM109...")
Signed-off-by: Johan Hovold <johan@kernel.org>
Cc: stable@vger.kernel.org	# 2.6.28
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Johan Hovold 2017-03-16 11:35:12 -07:00 committed by Dmitry Torokhov
parent 59cf8bed44
commit ac2ee9ba95
1 changed files with 4 additions and 0 deletions
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4
drivers/input/misc/cm109.c
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@ -700,6 +700,10 @@ static int cm109_usb_probe(struct usb_interface *intf,
int error = -ENOMEM; int error = -ENOMEM;
interface = intf->cur_altsetting; interface = intf->cur_altsetting;
if (interface->desc.bNumEndpoints < 1)
return -ENODEV;
endpoint = &interface->endpoint[0].desc; endpoint = &interface->endpoint[0].desc;
if (!usb_endpoint_is_int_in(endpoint)) if (!usb_endpoint_is_int_in(endpoint))