iommu/amd: Fix BUG when faulting a PROT_NONE VMA

handle_mm_fault indirectly triggers a BUG in do_numa_page
when given a VMA without read/write/execute access. Check
this condition in do_fault.

do_fault -> handle_mm_fault -> handle_pte_fault -> do_numa_page

  mm/memory.c
  3147  static int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
  ....
  3159  /* A PROT_NONE fault should not end up here */
  3160  BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));

Signed-off-by: Jay Cornwall <jay@jcornwall.me>
Cc: <stable@vger.kernel.org> # v4.1+
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu_v2.c

@@ -516,6 +516,13 @@ static void do_fault(struct work_struct *work)
 		goto out;
 	}
 
+	if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))) {
+		/* handle_mm_fault would BUG_ON() */
+		up_read(&mm->mmap_sem);
+		handle_fault_error(fault);
+		goto out;
+	}
+
 	ret = handle_mm_fault(mm, vma, address, write);
 	if (ret & VM_FAULT_ERROR) {
 		/* failed to service fault */