From patchwork Mon Mar 15 13:53:31 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 401335 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 4D000C2BA82 for ; Mon, 15 Mar 2021 14:04:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 21F9464F13 for ; Mon, 15 Mar 2021 14:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234533AbhCOOEM (ORCPT ); Mon, 15 Mar 2021 10:04:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:37670 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233105AbhCOOAk (ORCPT ); Mon, 15 Mar 2021 10:00:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8520864F83; Mon, 15 Mar 2021 14:00:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816826; bh=crG9gWp9IMJ+prHgTgVtp2fwvPLbxGDd4h4QNbdJBMY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Wdt3zQpUXfFgDX4v8JzqugoZvn8DnX8KRQlkEqyXyNzc2xlZH41a3V1Ubarelbwd0 NH0UsfkJKg9WfBGmHPWNadGxHqVtxWvKK3DsH3fKLg7lxxhkhv8fb3Fgs+h+4BRN6P UsYtC91spsSzIeiR9cMcdXVFgynnjbrlwd/CUKP8= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Lorenzo Pieralisi , Sasha Levin Subject: [PATCH 5.11 148/306] PCI: mediatek: Add missing of_node_put() to fix reference leak Date: Mon, 15 Mar 2021 14:53:31 +0100 Message-Id: <20210315135512.646600334@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135507.611436477@linuxfoundation.org> References: <20210315135507.611436477@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Krzysztof Wilczyński [ Upstream commit 42814c438aac79746d310f413a27d5b0b959c5de ] The for_each_available_child_of_node helper internally makes use of the of_get_next_available_child() which performs an of_node_get() on each iteration when searching for next available child node. Should an available child node be found, then it would return a device node pointer with reference count incremented, thus early return from the middle of the loop requires an explicit of_node_put() to prevent reference count leak. To stop the reference leak, explicitly call of_node_put() before returning after an error occurred. Link: https://lore.kernel.org/r/20210120184810.3068794-1-kw@linux.com Signed-off-by: Krzysztof Wilczyński Signed-off-by: Lorenzo Pieralisi Signed-off-by: Sasha Levin --- drivers/pci/controller/pcie-mediatek.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c index cf4c18f0c25a..23548b517e4b 100644 --- a/drivers/pci/controller/pcie-mediatek.c +++ b/drivers/pci/controller/pcie-mediatek.c @@ -1035,14 +1035,14 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) err = of_pci_get_devfn(child); if (err < 0) { dev_err(dev, "failed to parse devfn: %d\n", err); - return err; + goto error_put_node; } slot = PCI_SLOT(err); err = mtk_pcie_parse_port(pcie, child, slot); if (err) - return err; + goto error_put_node; } err = mtk_pcie_subsys_powerup(pcie); @@ -1058,6 +1058,9 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie) mtk_pcie_subsys_powerdown(pcie); return 0; +error_put_node: + of_node_put(child); + return err; } static int mtk_pcie_probe(struct platform_device *pdev)