diff --git a/mm/mmap.c b/mm/mmap.c
index 6966807b2cc2..e3a10b3cc6be 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3217,6 +3217,7 @@ void exit_mmap(struct mm_struct *mm)
 		vma = remove_vma(vma);
 		cond_resched();
 	}
+	mm->mmap = NULL;
 	mmap_write_unlock(mm);
 	vm_unacct_memory(nr_accounted);
 }