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iommu/vt-d: Fix possible use-after-free of private domain 

Multiple devices might share a private domain. One real example
is a pci bridge and all devices behind it. When remove a private
domain, make sure that it has been detached from all devices to
avoid use-after-free case.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Fixes: 942067f1b6 ("iommu/vt-d: Identify default domains replaced with private")
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2019-08-06 08:14:09 +08:00 committed by Joerg Roedel
parent ae23bfb68f
commit 3a18844dcf
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/intel-iommu.c
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@ -4791,7 +4791,8 @@ static void __dmar_remove_one_dev_info(struct device_domain_info *info)
/* free the private domain */
if (domain->flags & DOMAIN_FLAG_LOSE_CHILDREN &&
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY))
!(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) &&
list_empty(&domain->devices))
domain_exit(info->domain);
free_devinfo_mem(info);