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authorFenghua Yu <fenghua.yu@intel.com>2021-08-28 15:06:21 +0800
committerJoerg Roedel <jroedel@suse.de>2021-09-09 13:18:06 +0200
commita21518cb23a3c7d49bafcb59862fd389fd829d4b (patch)
treeb99e66045ca6ea37c562744731404ac39a7ce704
parenteb03f2d2f6a4da25d286613717d10add9ce9f175 (diff)
iommu/vt-d: Fix PASID leak in intel_svm_unbind_mm()
The mm->pasid will be used in intel_svm_free_pasid() after load_pasid() during unbinding mm. Clearing it in load_pasid() will cause PASID cannot be freed in intel_svm_free_pasid(). Additionally mm->pasid was updated already before load_pasid() during pasid allocation. No need to update it again in load_pasid() during binding mm. Don't update mm->pasid to avoid the issues in both binding mm and unbinding mm. Fixes: 4048377414162 ("iommu/vt-d: Use iommu_sva_alloc(free)_pasid() helpers") Reported-and-tested-by: Dave Jiang <dave.jiang@intel.com> Co-developed-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Link: https://lore.kernel.org/r/20210826215918.4073446-1-fenghua.yu@intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210828070622.2437559-2-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
-rw-r--r--drivers/iommu/intel/svm.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 2014fe8695ac..a3f84f2ff1ba 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -514,9 +514,6 @@ static void load_pasid(struct mm_struct *mm, u32 pasid)
{
mutex_lock(&mm->context.lock);
- /* Synchronize with READ_ONCE in update_pasid(). */
- smp_store_release(&mm->pasid, pasid);
-
/* Update PASID MSR on all CPUs running the mm's tasks. */
on_each_cpu_mask(mm_cpumask(mm), _load_pasid, NULL, true);