From patchwork Fri Mar 10 18:05:52 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 9617803 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D710A60414 for ; Fri, 10 Mar 2017 18:06:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C58F328763 for ; Fri, 10 Mar 2017 18:06:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BA4B928767; Fri, 10 Mar 2017 18:06:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7DC7928763 for ; Fri, 10 Mar 2017 18:06:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755291AbdCJSGA (ORCPT ); Fri, 10 Mar 2017 13:06:00 -0500 Received: from mx1.redhat.com ([209.132.183.28]:60094 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753818AbdCJSGA (ORCPT ); Fri, 10 Mar 2017 13:06:00 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 36BF9C05AA64; Fri, 10 Mar 2017 18:06:00 +0000 (UTC) Received: from plouf.banquise.eu.com (ovpn-116-39.ams2.redhat.com [10.36.116.39]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v2AI5vV9011824; Fri, 10 Mar 2017 13:05:58 -0500 From: Benjamin Tissoires To: Dmitry Torokhov , Andrew Duggan Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org Subject: [PATCH] Input: rmi4 - prevent null pointer dereference in f30 Date: Fri, 10 Mar 2017 19:05:52 +0100 Message-Id: <20170310180552.8375-1-benjamin.tissoires@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Fri, 10 Mar 2017 18:06:00 +0000 (UTC) Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If the platform data has f30_data.disable set, f30 in rmi_f30_config() might be null. Prevent a kernel oops by checking for non-null f30. Signed-off-by: Benjamin Tissoires --- drivers/input/rmi4/rmi_f30.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/input/rmi4/rmi_f30.c b/drivers/input/rmi4/rmi_f30.c index d8ff285..a0e4030 100644 --- a/drivers/input/rmi4/rmi_f30.c +++ b/drivers/input/rmi4/rmi_f30.c @@ -170,6 +170,10 @@ static int rmi_f30_config(struct rmi_function *fn) rmi_get_platform_data(fn->rmi_dev); int error; + /* can happen if f30_data.disable is set */ + if (!f30) + return 0; + if (pdata->f30_data.trackstick_buttons) { /* Try [re-]establish link to F03. */ f30->f03 = rmi_find_function(fn->rmi_dev, 0x03);