From patchwork Mon Dec 13 09:29:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 524397 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFEF0C433FE for ; Mon, 13 Dec 2021 09:41:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232760AbhLMJlW (ORCPT ); Mon, 13 Dec 2021 04:41:22 -0500 Received: from sin.source.kernel.org ([145.40.73.55]:33454 "EHLO sin.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233055AbhLMJjf (ORCPT ); Mon, 13 Dec 2021 04:39:35 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id BAF72CE0E83; Mon, 13 Dec 2021 09:39:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65299C00446; Mon, 13 Dec 2021 09:39:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1639388372; bh=S/hygQGUET9MIZyjYTY0CDNN5sHGYddTMZYOqSss/Fs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hoOjTaoXTcS3/+4lHcEg6IZcwB4ovajMNNdqIvAPDg4lbIg/xmQzGfppYjgNoLVEe K4no6Zk1/aHLALPYlKU/M9zh60dMlgHwZwOwyacOAFS4ZSwxmXKXt1QGaXmF4cD87l 5kfijAEHt+TeYt/gYKhECLcvgrt8rpm99AWEXWMw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jiri Kosina , Benjamin Tissoires , linux-input@vger.kernel.org Subject: [PATCH 4.19 06/74] HID: wacom: fix problems when device is not a valid USB device Date: Mon, 13 Dec 2021 10:29:37 +0100 Message-Id: <20211213092930.981333974@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20211213092930.763200615@linuxfoundation.org> References: <20211213092930.763200615@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Greg Kroah-Hartman commit 720ac467204a70308bd687927ed475afb904e11b upstream. The wacom driver accepts devices of more than just USB types, but some code paths can cause problems if the device being controlled is not a USB device due to a lack of checking. Add the needed checks to ensure that the USB device accesses are only happening on a "real" USB device, and not one on some other bus. Cc: Jiri Kosina Cc: Benjamin Tissoires Cc: linux-input@vger.kernel.org Cc: stable@vger.kernel.org Tested-by: Benjamin Tissoires Signed-off-by: Greg Kroah-Hartman Signed-off-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20211201183503.2373082-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman --- drivers/hid/wacom_sys.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -697,7 +697,7 @@ static void wacom_retrieve_hid_descripto * Skip the query for this type and modify defaults based on * interface number. */ - if (features->type == WIRELESS) { + if (features->type == WIRELESS && intf) { if (intf->cur_altsetting->desc.bInterfaceNumber == 0) features->device_type = WACOM_DEVICETYPE_WL_MONITOR; else @@ -2419,6 +2419,9 @@ static void wacom_wireless_work(struct w wacom_destroy_battery(wacom); + if (!usbdev) + return; + /* Stylus interface */ hdev1 = usb_get_intfdata(usbdev->config->interface[1]); wacom1 = hid_get_drvdata(hdev1); @@ -2698,8 +2701,6 @@ static void wacom_mode_change_work(struc static int wacom_probe(struct hid_device *hdev, const struct hid_device_id *id) { - struct usb_interface *intf = to_usb_interface(hdev->dev.parent); - struct usb_device *dev = interface_to_usbdev(intf); struct wacom *wacom; struct wacom_wac *wacom_wac; struct wacom_features *features; @@ -2736,8 +2737,14 @@ static int wacom_probe(struct hid_device wacom_wac->hid_data.inputmode = -1; wacom_wac->mode_report = -1; - wacom->usbdev = dev; - wacom->intf = intf; + if (hid_is_usb(hdev)) { + struct usb_interface *intf = to_usb_interface(hdev->dev.parent); + struct usb_device *dev = interface_to_usbdev(intf); + + wacom->usbdev = dev; + wacom->intf = intf; + } + mutex_init(&wacom->lock); INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work); INIT_WORK(&wacom->wireless_work, wacom_wireless_work);