diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 8e791a3..8e07342 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1262,6 +1262,9 @@
 	bool migrated = false;
 	int flags = 0;
 
+	/* A PROT_NONE fault should not end up here */
+	BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));
+
 	ptl = pmd_lock(mm, pmdp);
 	if (unlikely(!pmd_same(pmd, *pmdp)))
 		goto out_unlock;
diff --git a/mm/memory.c b/mm/memory.c
index bf244f5..f7886ab 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3013,6 +3013,9 @@
 	bool migrated = false;
 	int flags = 0;
 
+	/* A PROT_NONE fault should not end up here */
+	BUG_ON(!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)));
+
 	/*
 	* The "pte" at this point cannot be used safely without
 	* validation through pte_unmap_same(). It's of NUMA type but