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=-10.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 465C2C07E85 for ; Wed, 5 Dec 2018 09:49:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0B493213A2 for ; Wed, 5 Dec 2018 09:49:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Jqaa5bza" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0B493213A2 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729326AbeLEJtC (ORCPT ); Wed, 5 Dec 2018 04:49:02 -0500 Received: from mail.kernel.org ([198.145.29.99]:55026 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727337AbeLEJs7 (ORCPT ); Wed, 5 Dec 2018 04:48:59 -0500 Received: from sasha-vm.mshome.net (unknown [213.57.143.11]) (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 03CC32087F; Wed, 5 Dec 2018 09:48:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544003338; bh=U6QYTw+j009KxmoqweWjyXV1MVENm2ZfWJ7hgwSLW8o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Jqaa5bzaUd3Js4ZRD35ykTDX37moQqwpLQUJxNnERfXSCWzKyh+hahd+mHPBCc4iB u+ysfSoP+OMOZ6FLGLHdoukOGgM10PG/qTeuzkQOm9+eAnBH7ctV3zlgGGR1yLbsL1 sa+r+0w/IFVOKPWNo+o1OZZVNEJb3Cfa/v05aCHU= From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Janusz Krzysztofik , Tony Lindgren , Sasha Levin , linux-omap@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 04/45] ARM: OMAP1: ams-delta: Fix possible use of uninitialized field Date: Wed, 5 Dec 2018 04:46:25 -0500 Message-Id: <20181205094706.7225-4-sashal@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181205094706.7225-1-sashal@kernel.org> References: <20181205094706.7225-1-sashal@kernel.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Janusz Krzysztofik [ Upstream commit cec83ff1241ec98113a19385ea9e9cfa9aa4125b ] While playing with initialization order of modem device, it has been discovered that under some circumstances (early console init, I believe) its .pm() callback may be called before the uart_port->private_data pointer is initialized from plat_serial8250_port->private_data, resulting in NULL pointer dereference. Fix it by checking for uninitialized pointer before using it in modem_pm(). Fixes: aabf31737a6a ("ARM: OMAP1: ams-delta: update the modem to use regulator API") Signed-off-by: Janusz Krzysztofik Signed-off-by: Tony Lindgren Signed-off-by: Sasha Levin --- arch/arm/mach-omap1/board-ams-delta.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c index 6613a6ff5dbc..c4b634c54fbd 100644 --- a/arch/arm/mach-omap1/board-ams-delta.c +++ b/arch/arm/mach-omap1/board-ams-delta.c @@ -511,6 +511,9 @@ static void modem_pm(struct uart_port *port, unsigned int state, unsigned old) { struct modem_private_data *priv = port->private_data; + if (!priv) + return; + if (IS_ERR(priv->regulator)) return; -- 2.17.1