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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 C1035C4338F for ; Mon, 23 Aug 2021 16:17:36 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 90E9C613D1 for ; Mon, 23 Aug 2021 16:17:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 90E9C613D1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=RAeGfD8VeKIA4ll9aJNIybNnCW4LT4SemjG9WnN2UE8=; b=bFtFMXyJyvp1GZ E+tNeC/3rqYo+NejEpu4Nu2VrgJDeIka/GW0Dr44WtoPLDTl8FN4guUvEuzCa7m1hgGlF4iUZulBi 0+tfiDTVE+QePDPuKvaPJ82OUrg9bHvxdxN/moLhmPS+wmU/8mAAdGVthiRhWkeT7Bmici3tuipB3 YrkOuwzgYzAC3Ytsg+STTDlrf+0s5LrIvP276x+MA5UoSnjm9amH+Ht8XtaBH5fLiBBsyjUlvwoeM 0lq1pzklNQ6iBxBs0Erx4jhDkqwM+rt2tc1fo3TD8Pbqf6kFtjJCLSVt4pxx7/UeDvgjFsPdggmdZ /7tT8u8KbZng8WkFyj+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mICbu-00HYjC-L9; Mon, 23 Aug 2021 16:15:42 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mICbp-00HYhV-NL; Mon, 23 Aug 2021 16:15:39 +0000 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-Disposition: inline In-Reply-To: <20210813142648.GA12057@kili> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210823_091537_838917_5FDFCF9C X-CRM114-Status: GOOD ( 21.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel