diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
index a3eb1e826947..d2cf56dd8f91 100644
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -184,7 +184,10 @@ int dbMount(struct inode *ipbmap)
 		err = -EINVAL;
 		goto err_release_metapage;
 	}
-
+	if (bmp->db_l2nbperpage >= 64) {
+		err = -EINVAL;
+		goto err_release_metapage;
+	}
 	bmp->db_maxlevel = le32_to_cpu(dbmp_le->dn_maxlevel);
 	bmp->db_maxag = le32_to_cpu(dbmp_le->dn_maxag);
 	bmp->db_agpref = le32_to_cpu(dbmp_le->dn_agpref);