diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c
--- a/fs/jfs/jfs_dmap.c
+++ b/fs/jfs/jfs_dmap.c
@@ -2770,6 +2770,10 @@ static int dbJoin(dmtree_t *tp, int leafno, int newval, bool is_ctl)
 	int budsz, buddy;
 	s8 *leaf;
 
+	if (newval < 0 ||
+	    (newval >= tp->dmt_budmin && newval - tp->dmt_budmin >= 32))
+		return -EIO;
+
 	/* can the new leaf value require a join with other leaves ?
 	 */
 	if (newval >= tp->dmt_budmin) {