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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 94619C32751 for ; Sat, 10 Aug 2019 20:53:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 691C22086A for ; Sat, 10 Aug 2019 20:53:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727796AbfHJUxw (ORCPT ); Sat, 10 Aug 2019 16:53:52 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:53854 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726500AbfHJUnt (ORCPT ); Sat, 10 Aug 2019 16:43:49 -0400 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1hwYDJ-00053V-Mj; Sat, 10 Aug 2019 21:43:45 +0100 Received: from ben by deadeye with local (Exim 4.92) (envelope-from ) id 1hwYDJ-0003ZH-3f; Sat, 10 Aug 2019 21:43:45 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Greg Kroah-Hartman" , "Aditya Pakki" Date: Sat, 10 Aug 2019 21:40:07 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 023/157] serial: max310x: Fix to avoid potential NULL pointer dereference In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.72-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Aditya Pakki commit 3a10e3dd52e80b9a97a3346020024d17b2c272d6 upstream. of_match_device can return a NULL pointer when matching device is not found. This patch avoids a scenario causing NULL pointer derefernce. Signed-off-by: Aditya Pakki Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings --- drivers/tty/serial/max310x.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/tty/serial/max310x.c +++ b/drivers/tty/serial/max310x.c @@ -1324,6 +1324,8 @@ static int max310x_spi_probe(struct spi_ if (spi->dev.of_node) { const struct of_device_id *of_id = of_match_device(max310x_dt_ids, &spi->dev); + if (!of_id) + return -ENODEV; devtype = (struct max310x_devtype *)of_id->data; } else {