1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 5208828792e6..203b2e6a91cf 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -504,8 +504,10 @@ static void do_fault(struct work_struct *work)
 
         write = !!(fault->flags & PPR_FAULT_WRITE);
 
+        down_read(&fault->state->mm->mmap_sem);
         npages = get_user_pages(fault->state->task, fault->state->mm,
                                 fault->address, 1, write, 0, &page, NULL);
+        up_read(&fault->state->mm->mmap_sem);
 
         if (npages == 1) {
                 put_page(page);