1 files changed, 1 insertions, 0 deletions

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a959b3a4ddd5..7742fb36eb4d 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1273,6 +1273,7 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
                 pmd_t entry;
                 entry = pmdp_get_and_clear(mm, addr, pmd);
                 entry = pmd_modify(entry, newprot);
+                BUG_ON(pmd_write(entry));
                 set_pmd_at(mm, addr, pmd, entry);
                 spin_unlock(&vma->vm_mm->page_table_lock);
                 ret = 1;