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iommu/vt-d: Avoid freeing virtual machine domain in free_dmar_iommu()
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>
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@ -1480,7 +1480,8 @@ static void free_dmar_iommu(struct intel_iommu *iommu)
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domain = iommu->domains[i];
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clear_bit(i, iommu->domain_ids);
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if (domain_detach_iommu(domain, iommu) == 0)
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if (domain_detach_iommu(domain, iommu) == 0 &&
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!domain_type_is_vm(domain))
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domain_exit(domain);
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}
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}
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