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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 29D74CA9EA9 for ; Fri, 18 Oct 2019 22:12:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E43C1222C2 for ; Fri, 18 Oct 2019 22:12:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571436726; bh=EjkITLXyNWDDCTnEmWuqo6H79NQjrvKt7URBqdB9VYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hP1PjuZQ+YWn7YgC1UuLZNzkq2N81VMBRYkHmFAatysqw4fQwUbMYLb7XmcyeovtK 2nVxvEip/KvGqTxVZuZuiTPtSiZRaNSmdiooET3tXx4gmtE28mq9CtJRHrAr0Va0Hb yZBktfqqTGgvFcY9twbrsvsSgPflHbhhStMxiWlY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390081AbfJRWKZ (ORCPT ); Fri, 18 Oct 2019 18:10:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:43306 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390049AbfJRWKY (ORCPT ); Fri, 18 Oct 2019 18:10:24 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1BD6222476; Fri, 18 Oct 2019 22:10:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571436623; bh=EjkITLXyNWDDCTnEmWuqo6H79NQjrvKt7URBqdB9VYw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rgrtKyvqePzvoI+8DptvfUfhxkC9uvV+Wqs3oFL/Y5O10F7DVcoBsaqr20JAO3v+t A3mEofOjOtemz8JfBZg5ZBF1M3FI3rEgFAerBdXGd2hnNzVZi+wlbVwsC2yny6LG5M Km4Z+oiNWRWkXTriH7YxvxtCdrMpDK6mU1vjRgYI= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Adam Ford , Yegor Yefremov , Greg Kroah-Hartman , Sasha Levin , linux-serial@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 11/21] serial: mctrl_gpio: Check for NULL pointer Date: Fri, 18 Oct 2019 18:09:57 -0400 Message-Id: <20191018221007.10851-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191018221007.10851-1-sashal@kernel.org> References: <20191018221007.10851-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-serial-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Adam Ford [ Upstream commit 37e3ab00e4734acc15d96b2926aab55c894f4d9c ] When using mctrl_gpio_to_gpiod, it dereferences gpios into a single requested GPIO. This dereferencing can break if gpios is NULL, so this patch adds a NULL check before dereferencing it. If gpios is NULL, this function will also return NULL. Signed-off-by: Adam Ford Reviewed-by: Yegor Yefremov Link: https://lore.kernel.org/r/20191006163314.23191-1-aford173@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/tty/serial/serial_mctrl_gpio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index 02147361eaa94..2b5329a3d716a 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -67,6 +67,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { + if (gpios == NULL) + return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); -- 2.20.1