[PATCH v2 0/2] iommu: Fix domain check on release (part 1/2)

[Lu Baolu <baolu.lu@linux.intel.com>]

This is a follow-up to the discussion thread here:

https://lore.kernel.org/linux-iommu/20240221154012.GC13491@ziepe.ca/

It fixes a NULL pointer dereference issue in the Intel iommu driver and
strengthens the iommu core to possibly prevent similar failures in other
iommu drivers.

There are two parts of this topic:
[x] Introduce release_domain and fix a kernel NULL pointer dereference
    issue in the intel iommu driver.
[ ] A follow-up series to cleanup intel iommu driver.

Best regards,
baolu

Change log:

v2:
 - The scalable mode context entry should be removed in the release path
   as it's not part of the blocking domain.

v1: https://lore.kernel.org/linux-iommu/20240223051302.177596-1-baolu.lu@linux.intel.com/

Lu Baolu (2):
  iommu: Add static iommu_ops->release_domain
  iommu/vt-d: Fix NULL domain on device release

 include/linux/iommu.h       |  1 +
 drivers/iommu/intel/pasid.h |  1 +
 drivers/iommu/intel/iommu.c | 31 +++-----------
 drivers/iommu/intel/pasid.c | 83 +++++++++++++++++++++++++++++++++++++
 drivers/iommu/iommu.c       | 19 +++++++--
 5 files changed, 106 insertions(+), 29 deletions(-)

-- 
2.34.1