Commit 2a46ddf7 authored by Jiang Liu's avatar Jiang Liu Committed by Joerg Roedel

iommu/vt-d: Fix possible invalid memory access caused by free_dmar_iommu()

Static identity and virtual machine domains may be cached in
iommu->domain_ids array after corresponding IOMMUs have been removed
from domain->iommu_bmp. So we should check domain->iommu_bmp before
decreasing domain->iommu_count in function free_dmar_iommu(), otherwise
it may cause free of inuse domain data structure.
Signed-off-by: default avatarJiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 44bde614
...@@ -425,6 +425,8 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain, ...@@ -425,6 +425,8 @@ static void domain_remove_one_dev_info(struct dmar_domain *domain,
struct device *dev); struct device *dev);
static void iommu_detach_dependent_devices(struct intel_iommu *iommu, static void iommu_detach_dependent_devices(struct intel_iommu *iommu,
struct device *dev); struct device *dev);
static int domain_detach_iommu(struct dmar_domain *domain,
struct intel_iommu *iommu);
#ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON #ifdef CONFIG_INTEL_IOMMU_DEFAULT_ON
int dmar_disabled = 0; int dmar_disabled = 0;
...@@ -1465,8 +1467,7 @@ static int iommu_init_domains(struct intel_iommu *iommu) ...@@ -1465,8 +1467,7 @@ static int iommu_init_domains(struct intel_iommu *iommu)
static void free_dmar_iommu(struct intel_iommu *iommu) static void free_dmar_iommu(struct intel_iommu *iommu)
{ {
struct dmar_domain *domain; struct dmar_domain *domain;
int i, count; int i;
unsigned long flags;
if ((iommu->domains) && (iommu->domain_ids)) { if ((iommu->domains) && (iommu->domain_ids)) {
for_each_set_bit(i, iommu->domain_ids, cap_ndoms(iommu->cap)) { for_each_set_bit(i, iommu->domain_ids, cap_ndoms(iommu->cap)) {
...@@ -1479,11 +1480,7 @@ static void free_dmar_iommu(struct intel_iommu *iommu) ...@@ -1479,11 +1480,7 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
domain = iommu->domains[i]; domain = iommu->domains[i];
clear_bit(i, iommu->domain_ids); clear_bit(i, iommu->domain_ids);
if (domain_detach_iommu(domain, iommu) == 0)
spin_lock_irqsave(&domain->iommu_lock, flags);
count = --domain->iommu_count;
spin_unlock_irqrestore(&domain->iommu_lock, flags);
if (count == 0)
domain_exit(domain); domain_exit(domain);
} }
} }
......
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