From patchwork Wed Nov 24 23:04:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 12638033 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0206C433FE for ; Wed, 24 Nov 2021 23:05:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352390AbhKXXIR (ORCPT ); Wed, 24 Nov 2021 18:08:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:51046 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352370AbhKXXIR (ORCPT ); Wed, 24 Nov 2021 18:08:17 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1B413610A1; Wed, 24 Nov 2021 23:05:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1637795107; bh=wHpvNaIZ8v0pug4/Z5vHHcFvT4++TpzarXrssDbXZVs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JGT8hJLa2T+zGc61SnGCNTlnCroqIHmL02VnEYJ8IKaHCz0ACCroW2zdcRzkCXRws 0yhPDJqQzRDta3EdUNkwNXJ1tA+JmTat7s/SaYhp8niRmbS2ULzqzQxxiJTHcIatYi pfSDscfnre3vain3keXiz5NzW+riNSxKoXcdvnR4JrcS1lm49EA6zsvHNMwTfjx0ZA OZL4AcSt9zmGWtDj0TfdNAnSqlTeye/2peXEkqzsYP0wsJfth+6Hrhp1wnakDGQQav 4dYLZR1Qauh3O7hRE+d0Ed3CDNPmq08Dk3DYv3xPES80YJSdSrAh1wnmYT0Z0be3lU 2rVuqxjXwmQxA== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: Greg Kroah-Hartman , Sasha Levin Cc: pali@kernel.org, stable@vger.kernel.org, Wen Yang , Lorenzo Pieralisi , Thomas Petazzoni , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH 4.19 01/20] PCI: aardvark: Fix a leaked reference by adding missing of_node_put() Date: Thu, 25 Nov 2021 00:04:41 +0100 Message-Id: <20211124230500.27109-2-kabel@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211124230500.27109-1-kabel@kernel.org> References: <20211124230500.27109-1-kabel@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Wen Yang commit 3842f5166bf1ef286fe7a39f262b5c9581308366 upstream. The call to of_get_next_child() returns a node pointer with refcount incremented thus it must be explicitly decremented after the last usage. irq_domain_add_linear() also calls of_node_get() to increase refcount, so irq_domain will not be affected when it is released. Detected by coccinelle with the following warnings: ./drivers/pci/controller/pci-aardvark.c:826:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 798, but without a corresponding object release within this function. Signed-off-by: Wen Yang Signed-off-by: Lorenzo Pieralisi Cc: Thomas Petazzoni Cc: Lorenzo Pieralisi Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Marek Behún --- drivers/pci/controller/pci-aardvark.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 98fb3c1f45e4..3625d73e016a 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -754,6 +754,7 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie) struct device_node *node = dev->of_node; struct device_node *pcie_intc_node; struct irq_chip *irq_chip; + int ret = 0; raw_spin_lock_init(&pcie->irq_lock); @@ -768,8 +769,8 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie) irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-irq", dev_name(dev)); if (!irq_chip->name) { - of_node_put(pcie_intc_node); - return -ENOMEM; + ret = -ENOMEM; + goto out_put_node; } irq_chip->irq_mask = advk_pcie_irq_mask; @@ -781,11 +782,13 @@ static int advk_pcie_init_irq_domain(struct advk_pcie *pcie) &advk_pcie_irq_domain_ops, pcie); if (!pcie->irq_domain) { dev_err(dev, "Failed to get a INTx IRQ domain\n"); - of_node_put(pcie_intc_node); - return -ENOMEM; + ret = -ENOMEM; + goto out_put_node; } - return 0; +out_put_node: + of_node_put(pcie_intc_node); + return ret; } static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie)