Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933014AbcDKNod (ORCPT ); Mon, 11 Apr 2016 09:44:33 -0400 Received: from mx2.suse.de ([195.135.220.15]:37653 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932463AbcDKNYH (ORCPT ); Mon, 11 Apr 2016 09:24:07 -0400 X-Amavis-Alert: BAD HEADER SECTION, Duplicate header field: "References" From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Josh Boyer , Dmitry Torokhov , Jiri Slaby Subject: [PATCH 3.12 57/98] Input: powermate - fix oops with malicious USB descriptors Date: Mon, 11 Apr 2016 15:22:59 +0200 Message-Id: <35a13aa546e141fea9423fc70b6b2122b4e37dfa.1460380917.git.jslaby@suse.cz> X-Mailer: git-send-email 2.8.1 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1347 Lines: 40 From: Josh Boyer 3.12-stable review patch. If anyone has any objections, please let me know. =============== 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: Jiri Slaby --- 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 49c0c3ebd321..21ce1cf757bb 100644 --- a/drivers/input/misc/powermate.c +++ b/drivers/input/misc/powermate.c @@ -308,6 +308,9 @@ 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; -- 2.8.1