From patchwork Tue May 6 07:05:18 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiang Liu X-Patchwork-Id: 4119571 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 46DF6BFF02 for ; Tue, 6 May 2014 07:08:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 86AAE20204 for ; Tue, 6 May 2014 07:08:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B2356201FA for ; Tue, 6 May 2014 07:08:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934239AbaEFHEi (ORCPT ); Tue, 6 May 2014 03:04:38 -0400 Received: from mga09.intel.com ([134.134.136.24]:54817 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934184AbaEFHEd (ORCPT ); Tue, 6 May 2014 03:04:33 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP; 05 May 2014 23:59:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,995,1389772800"; d="scan'208";a="526662227" Received: from gerry-dev.bj.intel.com ([10.238.158.74]) by fmsmga001.fm.intel.com with ESMTP; 06 May 2014 00:03:36 -0700 From: Jiang Liu To: Joerg Roedel , David Woodhouse , Yinghai Lu , Bjorn Helgaas , Dan Williams , Vinod Koul , "Rafael J . Wysocki" Cc: Jiang Liu , Ashok Raj , Yijing Wang , Tony Luck , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-hotplug@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part3 V2 07/21] iommu/vt-d: avoid freeing virtual machine domain in free_dmar_iommu() Date: Tue, 6 May 2014 15:05:18 +0800 Message-Id: <1399359932-28972-8-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1399359932-28972-1-git-send-email-jiang.liu@linux.intel.com> References: <1399359932-28972-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Virtual machine domains are created by intel_iommu_domain_init() and should be destroyed by intel_iommu_domain_destroy(). So avoid freeing virtual machine domain data structure in free_dmar_iommu() when doamin->iommu_count reaches zero, otherwise it may cause invalid memory access because the IOMMU framework still holds references to the domain structure. Signed-off-by: Jiang Liu --- drivers/iommu/intel-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 1f10fcd1c696..5e865c1265ad 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1482,7 +1482,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu) domain = iommu->domains[i]; clear_bit(i, iommu->domain_ids); - if (domain_detach_iommu(domain, iommu) == 0) + if (domain_detach_iommu(domain, iommu) == 0 && + !domain_type_is_vm(domain)) domain_exit(domain); } }