diff --git a/mm/memory.c b/mm/memory.c
old mode 100644
new mode 100755
index ab749d7..6a939ae
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3550,15 +3550,24 @@
 {
 	struct vm_area_struct *vma = fe->vma;
 	pgoff_t pgoff = linear_page_index(vma, fe->address);
+	int ret;
 
 	/* The VMA was not fully populated on mmap() or missing VM_DONTEXPAND */
 	if (!vma->vm_ops->fault)
-		return VM_FAULT_SIGBUS;
-	if (!(fe->flags & FAULT_FLAG_WRITE))
-		return do_read_fault(fe, pgoff);
-	if (!(fe->vma_flags & VM_SHARED))
-		return do_cow_fault(fe, pgoff);
-	return do_shared_fault(fe, pgoff);
+		ret = VM_FAULT_SIGBUS;
+	else if (!(fe->flags & FAULT_FLAG_WRITE))
+		ret = do_read_fault(fe, pgoff);
+	else if (!(fe->vma_flags & VM_SHARED))
+		ret = do_cow_fault(fe, pgoff);
+	else
+		ret = do_shared_fault(fe, pgoff);
+
+	/* preallocated pagetable is unused: free it */
+	if (fe->prealloc_pte) {
+		pte_free(vma->vm_mm, fe->prealloc_pte);
+		fe->prealloc_pte = 0;
+	}
+	return ret;
 }
 
 static int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,