From patchwork Tue Oct 27 13:55:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 312680 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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, 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 1B658C388F9 for ; Tue, 27 Oct 2020 15:14:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2AD020728 for ; Tue, 27 Oct 2020 15:14:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811675; bh=qAnh+vrLGPL7KCrI1zAkhrziG/CFv+LUFxKOfyozpLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ilLw/GpduLk8WgfFF3Ae8SlgoEOzTgcKKMoCmzEt28L82MdIT/qEz4YgrXsdYPXyF r/TkRoTKkYBZ4eoIi50/NbgZFE1vy5GGnVpWnKd5092hjYluuNE4GZXfAbtwTLD0Pg IcIu8vepLFeDjhNT8BSNggFAYGbIuL5cASuLBpg0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1794948AbgJ0POd (ORCPT ); Tue, 27 Oct 2020 11:14:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:51548 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1794941AbgJ0POb (ORCPT ); Tue, 27 Oct 2020 11:14:31 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 B2DE120728; Tue, 27 Oct 2020 15:14:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603811670; bh=qAnh+vrLGPL7KCrI1zAkhrziG/CFv+LUFxKOfyozpLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lzu0oF6YiPWKPhwyM7izkmC43/sEJNCUeQg0vj7KZYEbjNlKY94JYw7JWcqmWJb5Z 9pHLheZD02Qw2P4ThWliJJ80ZpyMxkczBLuFSCuEdIWanH7RbUHkmdaAZxBgkkW3nj aEPqf+UCX+Neq+qraYLxQ69uw5CSMsdNnotyzpas= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Daniel Caujolle-Bert , Oliver Neukum , Johan Hovold , Sasha Levin Subject: [PATCH 5.8 575/633] USB: cdc-acm: handle broken union descriptors Date: Tue, 27 Oct 2020 14:55:18 +0100 Message-Id: <20201027135549.779268971@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135522.655719020@linuxfoundation.org> References: <20201027135522.655719020@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold [ Upstream commit 960c7339de27c6d6fec13b54880501c3576bb08d ] Handle broken union functional descriptors where the master-interface doesn't exist or where its class is of neither Communication or Data type (as required by the specification) by falling back to "combined-interface" probing. Note that this still allows for handling union descriptors with switched interfaces. This specifically makes the Whistler radio scanners TRX series devices work with the driver without adding further quirks to the device-id table. Reported-by: Daniel Caujolle-Bert Tested-by: Daniel Caujolle-Bert Acked-by: Oliver Neukum Signed-off-by: Johan Hovold Link: https://lore.kernel.org/r/20200921135951.24045-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/class/cdc-acm.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 7499ba118665a..c02488d469185 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1243,9 +1243,21 @@ static int acm_probe(struct usb_interface *intf, } } } else { + int class = -1; + data_intf_num = union_header->bSlaveInterface0; control_interface = usb_ifnum_to_if(usb_dev, union_header->bMasterInterface0); data_interface = usb_ifnum_to_if(usb_dev, data_intf_num); + + if (control_interface) + class = control_interface->cur_altsetting->desc.bInterfaceClass; + + if (class != USB_CLASS_COMM && class != USB_CLASS_CDC_DATA) { + dev_dbg(&intf->dev, "Broken union descriptor, assuming single interface\n"); + combined_interfaces = 1; + control_interface = data_interface = intf; + goto look_for_collapsed_interface; + } } if (!control_interface || !data_interface) {