From patchwork Tue Mar 31 08:59:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 228606 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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 D9578C43331 for ; Tue, 31 Mar 2020 09:18:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF49B21556 for ; Tue, 31 Mar 2020 09:18:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585646330; bh=TIixybRB4YOuIydEg4jkisdfemupE0rM2og/2zbTMQ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=1KgkGsgUl2zeiit0rRYx+/zULHxsu2LeLfMl5roobwhQdy4XHFWPvRkt7dS+3NW5I UOi8DIq3+VCt77PvWfrjW7ebgofv/Zsysq1b/rQbF+hgt77EYElRhKMCahVuDYxGj1 HmpSO+mob8WJFU81Y2D6v1X9F+9d6gzXAloRccfc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730285AbgCaJSt (ORCPT ); Tue, 31 Mar 2020 05:18:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:40508 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731975AbgCaJSs (ORCPT ); Tue, 31 Mar 2020 05:18:48 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3A7782072E; Tue, 31 Mar 2020 09:18:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585646327; bh=TIixybRB4YOuIydEg4jkisdfemupE0rM2og/2zbTMQ0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FXJIFZei31Q1SBZCm33+rb8DQKY/d6Ege/oQ1o2l4LmkKhZBubpl6TPWGV0eNp/J/ UMkJc8duVGtx/OI1DJqEnGCxmdUz/ux/zSUF+AH7TkKcdIMFHBrpsToWb+U/0qNUEn jrKGlSLcwevu083QH60jrJm4rYHHNZh+8JlLdgCo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hans de Goede , Johan Hovold , Hans Verkuil , Mauro Carvalho Chehab Subject: [PATCH 5.4 153/155] media: stv06xx: add missing descriptor sanity checks Date: Tue, 31 Mar 2020 10:59:53 +0200 Message-Id: <20200331085435.185157100@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200331085418.274292403@linuxfoundation.org> References: <20200331085418.274292403@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold commit 485b06aadb933190f4bc44e006076bc27a23f205 upstream. Make sure to check that we have two alternate settings and at least one endpoint before accessing the second altsetting structure and dereferencing the endpoint arrays. This specifically avoids dereferencing NULL-pointers or corrupting memory when a device does not have the expected descriptors. Note that the sanity checks in stv06xx_start() and pb0100_start() are not redundant as the driver is mixing looking up altsettings by index and by number, which may not coincide. Fixes: 8668d504d72c ("V4L/DVB (12082): gspca_stv06xx: Add support for st6422 bridge and sensor") Fixes: c0b33bdc5b8d ("[media] gspca-stv06xx: support bandwidth changing") Cc: stable # 2.6.31 Cc: Hans de Goede Signed-off-by: Johan Hovold Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/gspca/stv06xx/stv06xx.c | 19 ++++++++++++++++++- drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c | 4 ++++ 2 files changed, 22 insertions(+), 1 deletion(-) --- a/drivers/media/usb/gspca/stv06xx/stv06xx.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx.c @@ -282,6 +282,9 @@ static int stv06xx_start(struct gspca_de return -EIO; } + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); err = stv06xx_write_bridge(sd, STV_ISO_SIZE_L, packet_size); if (err < 0) @@ -306,11 +309,21 @@ out: static int stv06xx_isoc_init(struct gspca_dev *gspca_dev) { + struct usb_interface_cache *intfc; struct usb_host_interface *alt; struct sd *sd = (struct sd *) gspca_dev; + intfc = gspca_dev->dev->actconfig->intf_cache[0]; + + if (intfc->num_altsetting < 2) + return -ENODEV; + + alt = &intfc->altsetting[1]; + + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + /* Start isoc bandwidth "negotiation" at max isoc bandwidth */ - alt = &gspca_dev->dev->actconfig->intf_cache[0]->altsetting[1]; alt->endpoint[0].desc.wMaxPacketSize = cpu_to_le16(sd->sensor->max_packet_size[gspca_dev->curr_mode]); @@ -323,6 +336,10 @@ static int stv06xx_isoc_nego(struct gspc struct usb_host_interface *alt; struct sd *sd = (struct sd *) gspca_dev; + /* + * Existence of altsetting and endpoint was verified in + * stv06xx_isoc_init() + */ alt = &gspca_dev->dev->actconfig->intf_cache[0]->altsetting[1]; packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); min_packet_size = sd->sensor->min_packet_size[gspca_dev->curr_mode]; --- a/drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c +++ b/drivers/media/usb/gspca/stv06xx/stv06xx_pb0100.c @@ -185,6 +185,10 @@ static int pb0100_start(struct sd *sd) alt = usb_altnum_to_altsetting(intf, sd->gspca_dev.alt); if (!alt) return -ENODEV; + + if (alt->desc.bNumEndpoints < 1) + return -ENODEV; + packet_size = le16_to_cpu(alt->endpoint[0].desc.wMaxPacketSize); /* If we don't have enough bandwidth use a lower framerate */