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=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 A524CC433E1 for ; Mon, 17 Aug 2020 17:59:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 81E9E20716 for ; Mon, 17 Aug 2020 17:59:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597687157; bh=9UGYvTZuxS8KReSErAO6zMcVKaslegku5/vKJSj0UAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SFpzgo6bx3gz1Po/jnfOE1LlczOdCktLZC9+SWMtW635Zdgqx2IbkfrsFtYVNRTeV Jh5F42DddLpa8MHVwSVZz/dvw72ZwN7z4AtlQwaSN8PwMa0L9e7imy+z95iIGUPKEU DvkwTPuD4iVYlf8SI8JauFGKmnC2HPUIZMXIKPf8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390171AbgHQR6b (ORCPT ); Mon, 17 Aug 2020 13:58:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:35950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388542AbgHQQKR (ORCPT ); Mon, 17 Aug 2020 12:10:17 -0400 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 26B4322B47; Mon, 17 Aug 2020 16:10:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597680604; bh=9UGYvTZuxS8KReSErAO6zMcVKaslegku5/vKJSj0UAM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NUSniXkLWboZmNR7BIfRBVim9uE7ebXS88dLFmNBz9CIn2bf2LitM9H6JaSn2XgeR M2F09lDxwHgOrvW1h3KnTW2feylDWyxVuzfPQQWzn71hGLr4lIgkTUx02OIX2V52oj TZVhF3HjSpCOfTgT9hXocxgsBS9Emo+i7brbX1+Q= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jon Derrick , Thomas Gleixner , Andy Shevchenko , Bjorn Helgaas Subject: [PATCH 5.4 253/270] irqdomain/treewide: Free firmware node after domain removal Date: Mon, 17 Aug 2020 17:17:34 +0200 Message-Id: <20200817143808.427294047@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200817143755.807583758@linuxfoundation.org> References: <20200817143755.807583758@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: Jon Derrick commit ec0160891e387f4771f953b888b1fe951398e5d9 upstream. Commit 711419e504eb ("irqdomain: Add the missing assignment of domain->fwnode for named fwnode") unintentionally caused a dangling pointer page fault issue on firmware nodes that were freed after IRQ domain allocation. Commit e3beca48a45b fixed that dangling pointer issue by only freeing the firmware node after an IRQ domain allocation failure. That fix no longer frees the firmware node immediately, but leaves the firmware node allocated after the domain is removed. The firmware node must be kept around through irq_domain_remove, but should be freed it afterwards. Add the missing free operations after domain removal where where appropriate. Fixes: e3beca48a45b ("irqdomain/treewide: Keep firmware node unconditionally allocated") Signed-off-by: Jon Derrick Signed-off-by: Thomas Gleixner Reviewed-by: Andy Shevchenko Acked-by: Bjorn Helgaas # drivers/pci Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/1595363169-7157-1-git-send-email-jonathan.derrick@intel.com Signed-off-by: Greg Kroah-Hartman --- arch/mips/pci/pci-xtalk-bridge.c | 3 +++ arch/x86/kernel/apic/io_apic.c | 5 +++++ drivers/iommu/intel_irq_remapping.c | 8 ++++++++ drivers/pci/controller/vmd.c | 3 +++ 4 files changed, 19 insertions(+) --- a/arch/mips/pci/pci-xtalk-bridge.c +++ b/arch/mips/pci/pci-xtalk-bridge.c @@ -539,6 +539,7 @@ err_free_resource: pci_free_resource_list(&host->windows); err_remove_domain: irq_domain_remove(domain); + irq_domain_free_fwnode(fn); return err; } @@ -546,8 +547,10 @@ static int bridge_remove(struct platform { struct pci_bus *bus = platform_get_drvdata(pdev); struct bridge_controller *bc = BRIDGE_CONTROLLER(bus); + struct fwnode_handle *fn = bc->domain->fwnode; irq_domain_remove(bc->domain); + irq_domain_free_fwnode(fn); pci_lock_rescan_remove(); pci_stop_root_bus(bus); pci_remove_root_bus(bus); --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -2348,8 +2348,13 @@ static int mp_irqdomain_create(int ioapi static void ioapic_destroy_irqdomain(int idx) { + struct ioapic_domain_cfg *cfg = &ioapics[idx].irqdomain_cfg; + struct fwnode_handle *fn = ioapics[idx].irqdomain->fwnode; + if (ioapics[idx].irqdomain) { irq_domain_remove(ioapics[idx].irqdomain); + if (!cfg->dev) + irq_domain_free_fwnode(fn); ioapics[idx].irqdomain = NULL; } } --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -628,13 +628,21 @@ out_free_table: static void intel_teardown_irq_remapping(struct intel_iommu *iommu) { + struct fwnode_handle *fn; + if (iommu && iommu->ir_table) { if (iommu->ir_msi_domain) { + fn = iommu->ir_msi_domain->fwnode; + irq_domain_remove(iommu->ir_msi_domain); + irq_domain_free_fwnode(fn); iommu->ir_msi_domain = NULL; } if (iommu->ir_domain) { + fn = iommu->ir_domain->fwnode; + irq_domain_remove(iommu->ir_domain); + irq_domain_free_fwnode(fn); iommu->ir_domain = NULL; } free_pages((unsigned long)iommu->ir_table->base, --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -694,6 +694,7 @@ static int vmd_enable_domain(struct vmd_ if (!vmd->bus) { pci_free_resource_list(&resources); irq_domain_remove(vmd->irq_domain); + irq_domain_free_fwnode(fn); return -ENODEV; } @@ -808,6 +809,7 @@ static void vmd_cleanup_srcu(struct vmd_ static void vmd_remove(struct pci_dev *dev) { struct vmd_dev *vmd = pci_get_drvdata(dev); + struct fwnode_handle *fn = vmd->irq_domain->fwnode; sysfs_remove_link(&vmd->dev->dev.kobj, "domain"); pci_stop_root_bus(vmd->bus); @@ -816,6 +818,7 @@ static void vmd_remove(struct pci_dev *d vmd_teardown_dma_ops(vmd); vmd_detach_resources(vmd); irq_domain_remove(vmd->irq_domain); + irq_domain_free_fwnode(fn); } #ifdef CONFIG_PM_SLEEP