From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com ([143.182.124.21]:56623 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755722Ab3LFDVS (ORCPT ); Thu, 5 Dec 2013 22:21:18 -0500 From: Jiang Liu To: Joerg Roedel , David Woodhouse , Dan Williams , Vinod Koul , Ashok Raj , Yijing Wang , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org Cc: Jiang Liu , Tony Luck , Yinghai Lu , linux-pci@vger.kernel.org, dmaengine@vger.kernel.org Subject: [Patch Part1 V2 14/20] iommu/vt-d: avoid double free in error recovery path Date: Fri, 6 Dec 2013 11:21:17 +0800 Message-Id: <1386300083-6882-15-git-send-email-jiang.liu@linux.intel.com> In-Reply-To: <1386300083-6882-1-git-send-email-jiang.liu@linux.intel.com> References: <1386300083-6882-1-git-send-email-jiang.liu@linux.intel.com> Sender: linux-pci-owner@vger.kernel.org List-ID: The g_iommus array will be freed twice when failed to initialize IOMMU devices, which will cause system panic. 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 cbdb1ff..1a20171 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1293,19 +1293,10 @@ 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) @@ -2621,6 +2612,7 @@ error: for_each_active_iommu(iommu, drhd) free_dmar_iommu(iommu); kfree(g_iommus); + g_iommus = NULL; return ret; } -- 1.7.10.4