[Patch Part3 V2 07/21] iommu/vt-d: avoid freeing virtual machine domain in free_dmar_iommu()
Jiang Liu <[email protected]>
| Newsgroups | gmane.linux.kernel,gmane.linux.kernel.iommu,gmane.linux.kernel.pci,gmane.linux.hotplug.devel |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> --- drivers/iommu/intel-iommu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 1f10fcd1c696..5e865c1265ad 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1482,7 +1482,8 @@ 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); } } -- 1.7.10.4