diff --git a/drivers/md/md-cluster.c b/drivers/md/md-cluster.c
index e870b09b2c84..d08c63aaf10b 100644
--- a/drivers/md/md-cluster.c
+++ b/drivers/md/md-cluster.c
@@ -1234,6 +1234,7 @@ static void unlock_all_bitmaps(struct mddev *mddev)
 			}
 		}
 		kfree(cinfo->other_bitmap_lockres);
+		cinfo->other_bitmap_lockres = NULL;
 	}
 }