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 A3094C33CB3 for ; Tue, 28 Jan 2020 14:06:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C24724681 for ; Tue, 28 Jan 2020 14:06:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220417; bh=pmqHN+/C7U2lZy72AZuc5kA1ElFsvkkwvoGCGdIcREU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DtwnjYeL8coYpDcvmcQHutomnb0w2wTVumEsj5e6+/g6PPfoN+GDJ6n9qgPty27bB m8OBRTWBkyPIH5zca2WCeXAQ9Wstd2fWFjkXeOmrSIsbdunx2HZItsf/IutFs0x0DQ qt0N75OImC88pTZyA+hEMP1onh1Nr0RA34GlwcnE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727170AbgA1OEB (ORCPT ); Tue, 28 Jan 2020 09:04:01 -0500 Received: from mail.kernel.org ([198.145.29.99]:50762 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727948AbgA1ODw (ORCPT ); Tue, 28 Jan 2020 09:03:52 -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 A664F205F4; Tue, 28 Jan 2020 14:03:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580220232; bh=pmqHN+/C7U2lZy72AZuc5kA1ElFsvkkwvoGCGdIcREU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KTnkBk2g1MpSBfwCgygj5pBtgOvtt9Xyvd+bXB4Xq1CQNqs4XlVued5oMzdOqclX2 Su6nWs9Oz3xXYzsQYZaqgR8pe/rgjGieZB3czliLIA8PSGsSOkNa/6jeXZusKhPqcb Cy3IB1SaDk8V7UmKTa5VR0k8qkiKsul5kUp2bc+E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , Martin Kepplinger , Vladis Dronov , Dmitry Torokhov Subject: [PATCH 5.4 068/104] Input: pegasus_notetaker - fix endpoint sanity check Date: Tue, 28 Jan 2020 15:00:29 +0100 Message-Id: <20200128135826.795873755@linuxfoundation.org> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200128135817.238524998@linuxfoundation.org> References: <20200128135817.238524998@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 bcfcb7f9b480dd0be8f0df2df17340ca92a03b98 upstream. The driver was checking the number of endpoints of the first alternate setting instead of the current one, something which could be used by a malicious device (or USB descriptor fuzzer) to trigger a NULL-pointer dereference. Fixes: 1afca2b66aac ("Input: add Pegasus Notetaker tablet driver") Signed-off-by: Johan Hovold Acked-by: Martin Kepplinger Acked-by: Vladis Dronov Link: https://lore.kernel.org/r/20191210113737.4016-2-johan@kernel.org Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/input/tablet/pegasus_notetaker.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/input/tablet/pegasus_notetaker.c +++ b/drivers/input/tablet/pegasus_notetaker.c @@ -275,7 +275,7 @@ static int pegasus_probe(struct usb_inte return -ENODEV; /* Sanity check that the device has an endpoint */ - if (intf->altsetting[0].desc.bNumEndpoints < 1) { + if (intf->cur_altsetting->desc.bNumEndpoints < 1) { dev_err(&intf->dev, "Invalid number of endpoints\n"); return -EINVAL; }