Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755281AbcDJUU3 (ORCPT ); Sun, 10 Apr 2016 16:20:29 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:52966 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759412AbcDJS6P (ORCPT ); Sun, 10 Apr 2016 14:58:15 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum , Dmitry Torokhov Subject: [PATCH 4.5 223/238] Input: ims-pcu - sanity check against missing interfaces Date: Sun, 10 Apr 2016 11:36:40 -0700 Message-Id: <20160410183508.286387794@linuxfoundation.org> X-Mailer: git-send-email 2.8.0 In-Reply-To: <20160410183456.398741366@linuxfoundation.org> References: <20160410183456.398741366@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1149 Lines: 40 4.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Neukum commit a0ad220c96692eda76b2e3fd7279f3dcd1d8a8ff upstream. A malicious device missing interface can make the driver oops. Add sanity checking. Signed-off-by: Oliver Neukum Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/misc/ims-pcu.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/input/misc/ims-pcu.c +++ b/drivers/input/misc/ims-pcu.c @@ -1663,6 +1663,8 @@ static int ims_pcu_parse_cdc_data(struct pcu->ctrl_intf = usb_ifnum_to_if(pcu->udev, union_desc->bMasterInterface0); + if (!pcu->ctrl_intf) + return -EINVAL; alt = pcu->ctrl_intf->cur_altsetting; pcu->ep_ctrl = &alt->endpoint[0].desc; @@ -1670,6 +1672,8 @@ static int ims_pcu_parse_cdc_data(struct pcu->data_intf = usb_ifnum_to_if(pcu->udev, union_desc->bSlaveInterface0); + if (!pcu->data_intf) + return -EINVAL; alt = pcu->data_intf->cur_altsetting; if (alt->desc.bNumEndpoints != 2) {