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=-15.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 5C50EC4320A for ; Mon, 23 Aug 2021 16:15:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38AC2613DA for ; Mon, 23 Aug 2021 16:15:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230004AbhHWQQS (ORCPT ); Mon, 23 Aug 2021 12:16:18 -0400 Received: from foss.arm.com ([217.140.110.172]:55018 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229755AbhHWQQR (ORCPT ); Mon, 23 Aug 2021 12:16:17 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id BBB9F11D4; Mon, 23 Aug 2021 09:15:34 -0700 (PDT) Received: from lpieralisi (e121166-lin.cambridge.arm.com [10.1.196.255]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id F313E3F5A1; Mon, 23 Aug 2021 09:15:32 -0700 (PDT) Date: Mon, 23 Aug 2021 17:15:27 +0100 From: Lorenzo Pieralisi To: Dan Carpenter Cc: Rob Herring , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas , Heiko Stuebner , Liam Girdwood , Mark Brown , Shawn Lin , Kever Yang , Simon Xue , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, kernel-janitors@vger.kernel.org Subject: Re: [PATCH v2] PCI: rockchip-dwc: Potential error pointer dereference in probe Message-ID: <20210823161527.GA8289@lpieralisi> References: <20210813141257.GB7722@kadam> <20210813142648.GA12057@kili> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210813142648.GA12057@kili> User-Agent: Mutt/1.9.4 (2018-02-28) Precedence: bulk List-ID: X-Mailing-List: kernel-janitors@vger.kernel.org On Fri, Aug 13, 2021 at 05:26:48PM +0300, Dan Carpenter wrote: > If devm_regulator_get_optional() returns -ENODEV then it would lead > to an error pointer dereference on the next line and in the error > handling code. > > Fixes: e1229e884e19 ("PCI: rockchip-dwc: Add Rockchip RK356X host controller driver") > Signed-off-by: Dan Carpenter > --- > v2: The -ENODEV from devm_regulator_get_optional() has to be handled > specially. > > drivers/pci/controller/dwc/pcie-dw-rockchip.c | 17 ++++++++++------- > 1 file changed, 10 insertions(+), 7 deletions(-) I squashed it in with the patch that is fixing, thanks a lot. Lorenzo > diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > index 20cef2e06f66..c9b341e55cbb 100644 > --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c > +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c > @@ -224,15 +224,17 @@ static int rockchip_pcie_probe(struct platform_device *pdev) > > /* DON'T MOVE ME: must be enable before PHY init */ > rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3"); > - if (IS_ERR(rockchip->vpcie3v3)) > + if (IS_ERR(rockchip->vpcie3v3)) { > if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV) > return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3), > "failed to get vpcie3v3 regulator\n"); > - > - ret = regulator_enable(rockchip->vpcie3v3); > - if (ret) { > - dev_err(dev, "failed to enable vpcie3v3 regulator\n"); > - return ret; > + rockchip->vpcie3v3 = NULL; > + } else { > + ret = regulator_enable(rockchip->vpcie3v3); > + if (ret) { > + dev_err(dev, "failed to enable vpcie3v3 regulator\n"); > + return ret; > + } > } > > ret = rockchip_pcie_phy_init(rockchip); > @@ -255,7 +257,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev) > deinit_phy: > rockchip_pcie_phy_deinit(rockchip); > disable_regulator: > - regulator_disable(rockchip->vpcie3v3); > + if (rockchip->vpcie3v3) > + regulator_disable(rockchip->vpcie3v3); > > return ret; > } > -- > 2.20.1 >