diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index bddf4f3d27a7..e18e21b24210 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -2029,7 +2029,10 @@ int md_bitmap_get_stats(struct bitmap *bitmap, struct md_bitmap_stats *stats)
 
 	if (!bitmap)
 		return -ENOENT;
-
+	if (bitmap->mddev->bitmap_info.external)
+		return -ENOENT;
+	if (!bitmap->storage.sb_page) /* no superblock */
+		return -EINVAL;
 	sb = kmap_local_page(bitmap->storage.sb_page);
 	stats->sync_size = le64_to_cpu(sb->sync_size);
 	kunmap_local(sb);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index a52843826a95..5e2751d42f64 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -8368,6 +8368,9 @@ static int md_seq_show(struct seq_file *seq, void *v)
 		return 0;
 	}
 
+	/* prevent bitmap to be freed after checking */
+	mutex_lock(&mddev->bitmap_info.mutex);
+
 	spin_lock(&mddev->lock);
 	if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
 		seq_printf(seq, "%s : %sactive", mdname(mddev),
@@ -8438,6 +8441,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
 		seq_printf(seq, "\n");
 	}
 	spin_unlock(&mddev->lock);
+	mutex_unlock(&mddev->bitmap_info.mutex);
 
 	return 0;
 }