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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 461ABC43603 for ; Wed, 4 Dec 2019 18:00:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 18E992084B for ; Wed, 4 Dec 2019 18:00:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575482451; bh=CdHIyb+spZ4uCTNPuHhgh/IkApWBIPe8m08Pr7pEfmw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xyECz9Lk4u4nqVaALezvfkN4ESieMK2KA13VqgF69kj7Nr8CT3hEvPBsehMGk1hTV 1jqm53VHKDX8/moaczyGPSfM0yMA8g1bpB89ZbCD+VyLYRgigwEZPzMT53pLcPUEHX nxPulpkiys0mHTo0u8tZVZ/+KQUiPuHoBPF/cZjU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729442AbfLDSAt (ORCPT ); Wed, 4 Dec 2019 13:00:49 -0500 Received: from mail.kernel.org ([198.145.29.99]:39944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729424AbfLDSAq (ORCPT ); Wed, 4 Dec 2019 13:00:46 -0500 Received: from localhost (unknown [217.68.49.72]) (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 F27082084B; Wed, 4 Dec 2019 18:00:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575482445; bh=CdHIyb+spZ4uCTNPuHhgh/IkApWBIPe8m08Pr7pEfmw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YEycKN0muBBxVYNirZI1p3nJ5G1I28fnJVPP7jYVRVwfhRJ+cYuuJGfwtBIQzM4Ix fbCaiJlfg5V6s6IcfEC53nG4AKgOsWdScgswciVilCEQGV3y08z8yyWpFJZXmM16UA 0hx8dpMPL2iszwL3vXishkWkMvTeZJIoyZBgQVV8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kangjie Lu , Mark Brown , Sasha Levin Subject: [PATCH 4.4 40/92] drivers/regulator: fix a missing check of return value Date: Wed, 4 Dec 2019 18:49:40 +0100 Message-Id: <20191204174332.953475965@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191204174327.215426506@linuxfoundation.org> References: <20191204174327.215426506@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: Kangjie Lu [ Upstream commit 966e927bf8cc6a44f8b72582a1d6d3ffc73b12ad ] If palmas_smps_read() fails, we should not use the read data in "reg" which may contain random value. The fix inserts a check for the return value of palmas_smps_read(): If it fails, we return the error code upstream and stop using "reg". Signed-off-by: Kangjie Lu Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/palmas-regulator.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c index 8217613807d37..4a4766c43e616 100644 --- a/drivers/regulator/palmas-regulator.c +++ b/drivers/regulator/palmas-regulator.c @@ -435,13 +435,16 @@ static int palmas_ldo_write(struct palmas *palmas, unsigned int reg, static int palmas_set_mode_smps(struct regulator_dev *dev, unsigned int mode) { int id = rdev_get_id(dev); + int ret; struct palmas_pmic *pmic = rdev_get_drvdata(dev); struct palmas_pmic_driver_data *ddata = pmic->palmas->pmic_ddata; struct palmas_regs_info *rinfo = &ddata->palmas_regs_info[id]; unsigned int reg; bool rail_enable = true; - palmas_smps_read(pmic->palmas, rinfo->ctrl_addr, ®); + ret = palmas_smps_read(pmic->palmas, rinfo->ctrl_addr, ®); + if (ret) + return ret; reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK; -- 2.20.1