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=-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=unavailable 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 CC9F5C388F9 for ; Tue, 27 Oct 2020 14:58:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4871421527 for ; Tue, 27 Oct 2020 14:58:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603810685; bh=qAnh+vrLGPL7KCrI1zAkhrziG/CFv+LUFxKOfyozpLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aSL37o59IykGwklp7+FjPGTI/xxGa5Nj5NWYMfM80LQ2Lhiiq1m9kE5W1WORkFT8L i+SEjB+l27DYNE3swidOpx0r4u7jntyGMisRsREOMDl1Q2t9IVmIM5Up9krdh8qPBy 6NdE7rBWjmjnpyOtd9dy3pohw9CBPHS6TsjFY9bY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1783308AbgJ0O6D (ORCPT ); Tue, 27 Oct 2020 10:58:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:45004 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763843AbgJ0OpE (ORCPT ); Tue, 27 Oct 2020 10:45:04 -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 03D2A206B2; Tue, 27 Oct 2020 14:45:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603809903; bh=qAnh+vrLGPL7KCrI1zAkhrziG/CFv+LUFxKOfyozpLw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v5wArRXeymzeST0V4a3vQBaMq4I1b0UUDeFqqQIJdeH6AYyXQD97OThphwniovEbn DWySeng6KTZw8jPJHlX5ppGPSWZgAp2tX+v279AtXEkvdMF9paiM+3NaqPMuO9u3O9 0IdaW6milTSydAElKUpg9cKbldfokQUd3jeSGT50= 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 5.4 361/408] USB: cdc-acm: handle broken union descriptors Date: Tue, 27 Oct 2020 14:54:59 +0100 Message-Id: <20201027135511.763429862@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135455.027547757@linuxfoundation.org> References: <20201027135455.027547757@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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) { -- 2.25.1