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=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 C8524C3276C for ; Thu, 2 Jan 2020 22:43:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9DC8220866 for ; Thu, 2 Jan 2020 22:43:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578005025; bh=Y6oTPyUWl/LYXYiiXw8VnlrTivTKYu9uWlex9b/y5nM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xk9etVn5U9/FAr5n4/XhgoiHcePQ14ZxWzJr4RfyM1jcQNFTdrEBS8gysZlIS+NR4 nMfAJUVeQVj2eYqrbD71AmN/vBsIjO/LPyM0TMXoo1afW7Ti4sFKcIlIDAL6ynxXsx cLOpQ50c4jtqtPxScKG+CYj34b8CY940LlmbZnLE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729657AbgABWno (ORCPT ); Thu, 2 Jan 2020 17:43:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:42912 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728341AbgABWeY (ORCPT ); Thu, 2 Jan 2020 17:34:24 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 1FD3320866; Thu, 2 Jan 2020 22:34:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1578004463; bh=Y6oTPyUWl/LYXYiiXw8VnlrTivTKYu9uWlex9b/y5nM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qGOuBZZla0WedbfUfZ+Qi0VwrLRnJHxu9NBqze0R63sFWAA191nLaoBAN7/pR5x3T hl5QQFGTDj3Sgy3hrpIOT2lR4sASWwF4F9Q/JtlxftyNj+XL0iceq/xiR8N8qZ2sVU MSP3tiAEBVm2/GlDWahhZt2Xo4MmlUQuyV9iV56k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yizhuo , Mark Brown , Sasha Levin Subject: [PATCH 4.4 018/137] regulator: max8907: Fix the usage of uninitialized variable in max8907_regulator_probe() Date: Thu, 2 Jan 2020 23:06:31 +0100 Message-Id: <20200102220549.118412336@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200102220546.618583146@linuxfoundation.org> References: <20200102220546.618583146@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: Yizhuo [ Upstream commit 472b39c3d1bba0616eb0e9a8fa3ad0f56927c7d7 ] Inside function max8907_regulator_probe(), variable val could be uninitialized if regmap_read() fails. However, val is used later in the if statement to decide the content written to "pmic", which is potentially unsafe. Signed-off-by: Yizhuo Link: https://lore.kernel.org/r/20191003175813.16415-1-yzhai003@ucr.edu Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/max8907-regulator.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/regulator/max8907-regulator.c b/drivers/regulator/max8907-regulator.c index 5e941db5ccaf..c7e70cfb581f 100644 --- a/drivers/regulator/max8907-regulator.c +++ b/drivers/regulator/max8907-regulator.c @@ -299,7 +299,10 @@ static int max8907_regulator_probe(struct platform_device *pdev) memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc)); /* Backwards compatibility with MAX8907B; SD1 uses different voltages */ - regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val); + ret = regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val); + if (ret) + return ret; + if ((val & MAX8907_II2RR_VERSION_MASK) == MAX8907_II2RR_VERSION_REV_B) { pmic->desc[MAX8907_SD1].min_uV = 637500; @@ -336,14 +339,20 @@ static int max8907_regulator_probe(struct platform_device *pdev) } if (pmic->desc[i].ops == &max8907_ldo_ops) { - regmap_read(config.regmap, pmic->desc[i].enable_reg, + ret = regmap_read(config.regmap, pmic->desc[i].enable_reg, &val); + if (ret) + return ret; + if ((val & MAX8907_MASK_LDO_SEQ) != MAX8907_MASK_LDO_SEQ) pmic->desc[i].ops = &max8907_ldo_hwctl_ops; } else if (pmic->desc[i].ops == &max8907_out5v_ops) { - regmap_read(config.regmap, pmic->desc[i].enable_reg, + ret = regmap_read(config.regmap, pmic->desc[i].enable_reg, &val); + if (ret) + return ret; + if ((val & (MAX8907_MASK_OUT5V_VINEN | MAX8907_MASK_OUT5V_ENSRC)) != MAX8907_MASK_OUT5V_ENSRC) -- 2.20.1