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=-6.8 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,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 CA4F4C2D0DB for ; Tue, 28 Jan 2020 14:33:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9CCC920716 for ; Tue, 28 Jan 2020 14:33:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580222018; bh=C80hO95fUlhePgToChD8CSc4I8Aj6cloQwLGUMaNs+s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AKwnsH/uYY3nd+OLxrKBCdIkxT44JrUWfDzyhg2AhQuBWNn12jZ/PWGHzf347RAB/ qe8eZEqiKgCX4uwwBEU1+VEuPWBn211BbRyXKIftND4JxsXqBT6ks9lXvNteZS2fMg zGGuWydzuON48MDXbjC7S/L/PGnqwT2OKCE4hu5I= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731074AbgA1Odg (ORCPT ); Tue, 28 Jan 2020 09:33:36 -0500 Received: from mail.kernel.org ([198.145.29.99]:52086 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732869AbgA1OZL (ORCPT ); Tue, 28 Jan 2020 09:25:11 -0500 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 D14D121739; Tue, 28 Jan 2020 14:25:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580221510; bh=C80hO95fUlhePgToChD8CSc4I8Aj6cloQwLGUMaNs+s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DyyRYAlEw7hxIGLGSb0ZEkRxpnQoes8dIU+2sIfRjgdEw856q2f4dsdV6AjwMYjqu x+9CmW/a9TawulEnXH3vSwWAmQMCsrJqVBEkHiWmbn+dXOpKc6g4tPqnRhNPGpb9rk 2KWKpV3XLXdNr5pqevsuNdCcqWMqhAjKa3/Xl/5g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Vladis Dronov , Dmitry Torokhov Subject: [PATCH 4.9 253/271] Input: gtco - fix endpoint sanity check Date: Tue, 28 Jan 2020 15:06:42 +0100 Message-Id: <20200128135911.409469855@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135852.449088278@linuxfoundation.org> References: <20200128135852.449088278@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold commit a8eeb74df5a6bdb214b2b581b14782c5f5a0cf83 upstream. The driver was checking the number of endpoints of the first alternate setting instead of the current one, something which could lead to the driver binding to an invalid interface. This in turn could cause the driver to misbehave or trigger a WARN() in usb_submit_urb() that kernels with panic_on_warn set would choke on. Fixes: 162f98dea487 ("Input: gtco - fix crash on detecting device without endpoints") Signed-off-by: Johan Hovold Acked-by: Vladis Dronov Link: https://lore.kernel.org/r/20191210113737.4016-5-johan@kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/tablet/gtco.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) --- a/drivers/input/tablet/gtco.c +++ b/drivers/input/tablet/gtco.c @@ -875,18 +875,14 @@ static int gtco_probe(struct usb_interfa } /* Sanity check that a device has an endpoint */ - if (usbinterface->altsetting[0].desc.bNumEndpoints < 1) { + if (usbinterface->cur_altsetting->desc.bNumEndpoints < 1) { dev_err(&usbinterface->dev, "Invalid number of endpoints\n"); error = -EINVAL; goto err_free_urb; } - /* - * The endpoint is always altsetting 0, we know this since we know - * this device only has one interrupt endpoint - */ - endpoint = &usbinterface->altsetting[0].endpoint[0].desc; + endpoint = &usbinterface->cur_altsetting->endpoint[0].desc; /* Some debug */ dev_dbg(&usbinterface->dev, "gtco # interfaces: %d\n", usbinterface->num_altsetting); @@ -973,7 +969,7 @@ static int gtco_probe(struct usb_interfa input_dev->dev.parent = &usbinterface->dev; /* Setup the URB, it will be posted later on open of input device */ - endpoint = &usbinterface->altsetting[0].endpoint[0].desc; + endpoint = &usbinterface->cur_altsetting->endpoint[0].desc; usb_fill_int_urb(gtco->urbinfo, udev,