From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753005AbaAFGSj (ORCPT ); Mon, 6 Jan 2014 01:18:39 -0500 Received: from mga14.intel.com ([143.182.124.37]:2448 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752955AbaAFGSg (ORCPT ); Mon, 6 Jan 2014 01:18:36 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,611,1384329600"; d="scan'208";a="401364920" From: Jiang Liu To: Joerg Roedel , David Woodhouse , Yinghai Lu , Dan Williams , Vinod Koul Cc: Jiang Liu , Ashok Raj , Yijing Wang , Tony Luck , iommu@lists.linux-foundation.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part1 V3 14/20] iommu/vt-d: avoid double free in error recovery path Date: Mon, 6 Jan 2014 14:18:21 +0800 Message-Id: <1388989107-4795-15-git-send-email-jiang.liu@linux.intel.com> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1388989107-4795-1-git-send-email-jiang.liu@linux.intel.com> References: <1388989107-4795-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The g_iommus array will be freed twice when failed to initialize IOMMU devices, so fix the double free. Signed-off-by: Jiang Liu --- drivers/iommu/intel-iommu.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 60fa821..ccf7304 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1295,19 +1295,10 @@ static void free_dmar_iommu(struct intel_iommu *iommu) iommu->domains = NULL; iommu->domain_ids = NULL; - g_iommus[iommu->seq_id] = NULL; - - /* if all iommus are freed, free g_iommus */ - for (i = 0; i < g_num_of_iommus; i++) { - if (g_iommus[i]) - break; - } - - if (i == g_num_of_iommus) - kfree(g_iommus); - /* free context mapping */ free_context_table(iommu); + + g_iommus[iommu->seq_id] = NULL; } static struct dmar_domain *alloc_domain(void) @@ -2624,6 +2615,7 @@ error: for_each_active_iommu(iommu, drhd) free_dmar_iommu(iommu); kfree(g_iommus); + g_iommus = NULL; return ret; } -- 1.7.10.4