Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756141AbcDBAyr (ORCPT ); Fri, 1 Apr 2016 20:54:47 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:53811 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756064AbcDBAyn (ORCPT ); Fri, 1 Apr 2016 20:54:43 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Josh Boyer , Dmitry Torokhov , Kamal Mostafa Subject: [PATCH 3.19.y-ckt 011/170] Input: powermate - fix oops with malicious USB descriptors Date: Fri, 1 Apr 2016 17:51:37 -0700 Message-Id: <1459558456-24452-12-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1459558456-24452-1-git-send-email-kamal@canonical.com> References: <1459558456-24452-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.19 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1405 Lines: 41 3.19.8-ckt18 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Josh Boyer 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 Signed-off-by: Josh Boyer Signed-off-by: Dmitry Torokhov Signed-off-by: Kamal Mostafa --- 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 63b539d..84909a1 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; -- 2.7.4