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| author | Lu Baolu | 2019-08-06 02:14:09 +0200 |
|---|---|---|
| committer | Joerg Roedel | 2019-08-09 17:35:25 +0200 |
| commit | 3a18844dcf89e636b2d0cbf577e3963b0bcb6d23 (patch) | |
| tree | d2e1a012c4e47e8a5d1740ae19f12d366ebac4b4 /drivers/iommu | |
| parent | iommu/vt-d: Detach domain before using a private one (diff) | |
| download | kernel-qcow2-linux-3a18844dcf89e636b2d0cbf577e3963b0bcb6d23.tar.gz kernel-qcow2-linux-3a18844dcf89e636b2d0cbf577e3963b0bcb6d23.tar.xz kernel-qcow2-linux-3a18844dcf89e636b2d0cbf577e3963b0bcb6d23.zip | |
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: 942067f1b6b97 ("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>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 37259b7f95a7..12d094d08c0a 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -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); |