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iommu/vt-d: Avoid freeing virtual machine domain in free_dmar_iommu()

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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 <jiang.liu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jiang Liu 2014-07-11 14:19:31 +08:00 committed by Joerg Roedel
parent 2a46ddf77c
commit 129ad28100
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -1480,7 +1480,8 @@ 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);
}
}