From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C327C54FD0 for ; Thu, 23 Apr 2020 23:08:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 624FA2087E for ; Thu, 23 Apr 2020 23:08:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727967AbgDWXI4 (ORCPT ); Thu, 23 Apr 2020 19:08:56 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:50882 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728653AbgDWXG7 (ORCPT ); Thu, 23 Apr 2020 19:06:59 -0400 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jRkvk-0004y2-QY; Fri, 24 Apr 2020 00:06:52 +0100 Received: from ben by deadeye with local (Exim 4.93) (envelope-from ) id 1jRkvg-00E72Z-P0; Fri, 24 Apr 2020 00:06:48 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Hans de Goede" , "Johan Hovold" , "Mauro Carvalho Chehab" , "Hans Verkuil" Date: Fri, 24 Apr 2020 00:07:34 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 227/245] media: ov519: add missing endpoint sanity checks In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.83-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 998912346c0da53a6dbb71fab3a138586b596b30 upstream. Make sure to check that we have at least one endpoint before accessing the endpoint array to avoid dereferencing a NULL-pointer on stream start. Note that these sanity checks are not redundant as the driver is mixing looking up altsettings by index and by number, which need not coincide. Fixes: 1876bb923c98 ("V4L/DVB (12079): gspca_ov519: add support for the ov511 bridge") Fixes: b282d87332f5 ("V4L/DVB (12080): gspca_ov519: Fix ov518+ with OV7620AE (Trust spacecam 320)") Cc: Hans de Goede Signed-off-by: Johan Hovold Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Ben Hutchings --- drivers/media/usb/gspca/ov519.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/media/usb/gspca/ov519.c +++ b/drivers/media/usb/gspca/ov519.c @@ -3497,6 +3497,11 @@ static void ov511_mode_init_regs(struct return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); reg_w(sd, R51x_FIFO_PSIZE, packet_size >> 5); @@ -3622,6 +3627,11 @@ static void ov518_mode_init_regs(struct return; } + if (alt->desc.bNumEndpoints < 1) { + sd->gspca_dev.usb_err = -ENODEV; + return; + } + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); ov518_reg_w32(sd, R51x_FIFO_PSIZE, packet_size & ~7, 2);