diff --git a/net/batman-adv/tp_meter.c b/net/batman-adv/tp_meter.c
index b7fee6e55f03..5cc719c81ea0 100644
--- a/net/batman-adv/tp_meter.c
+++ b/net/batman-adv/tp_meter.c
@@ -1406,6 +1406,7 @@ static bool batadv_tp_handle_out_of_order(struct batadv_tp_receiver *tp_vars,
 	__must_hold(&tp_vars->common.unacked_lock)
 {
 	struct batadv_tp_unacked *un, *new;
+	struct batadv_tp_unacked *safe;
 	bool added = false;
 
 	new = kmalloc_obj(*new, GFP_ATOMIC);
@@ -1430,20 +1431,46 @@ static bool batadv_tp_handle_out_of_order(struct batadv_tp_receiver *tp_vars,
 	 * seqno than all the others already stored.
 	 */
 	list_for_each_entry_reverse(un, &tp_vars->common.unacked_list, list) {
-		/* check for duplicates */
-		if (new->seqno == un->seqno) {
-			if (new->len > un->len)
-				un->len = new->len;
-			kfree(new);
-			added = true;
-			break;
-		}
-
-		/* look for the right position */
+		/* look for the right position - an un which is smaller */
 		if (batadv_seq_before(new->seqno, un->seqno))
 			continue;
 
-		/* as soon as an entry having a bigger seqno is found, the new
+		/* smaller/equal seqno was found but they might be directly
+		 * after another or overlapping. keep only a single entry
+		 *
+		 * It is already known that:
+		 *
+		 *	un->seqno <= new->seqno
+		 *
+		 * When establishing that:
+		 *
+		 *	new->seqno <= un->seqno + un->len
+		 *
+		 * Then it is not necessary to add a new entry because the
+		 * smaller/equal seqno of un might already contain the new
+		 * received packet or we only add new data directly after
+		 * the end of un. The latter can be identified using:
+		 *
+		 *	un->seqno + un->len <= new->seqno + new->len
+		 */
+		if (!batadv_seq_before(un->seqno + un->len, new->seqno)) {
+			/* new data directly after un? */
+			if (!batadv_seq_before(new->seqno + new->len,
+					       un->seqno + un->len))
+				un->len = new->seqno + new->len - un->seqno;
+
+			/* un now represents both old un + new */
+			kfree(new);
+			added = true;
+
+			/* un has to be used to check if the gap to the next
+			 * seqno range was closed
+			 */
+			new = un;
+			break;
+		}
+
+		/* as soon as an entry having a smaller seqno is found, the new
 		 * one is attached _after_ it. In this way the list is kept in
 		 * ascending order
 		 */
@@ -1459,6 +1486,22 @@ static bool batadv_tp_handle_out_of_order(struct batadv_tp_receiver *tp_vars,
 		tp_vars->common.unacked_count++;
 	}
 
+	/* check if new filled the gap to the next list entries */
+	un = new;
+	list_for_each_entry_safe_continue(un, safe, &tp_vars->common.unacked_list, list) {
+		if (batadv_seq_before(new->seqno + new->len, un->seqno))
+			break;
+
+		/* next entry is overlapping or adjacent - combine both */
+		if (batadv_seq_before(new->seqno + new->len,
+				      un->seqno + un->len))
+			new->len = un->seqno + un->len - new->seqno;
+
+		list_del(&un->list);
+		kfree(un);
+		tp_vars->common.unacked_count--;
+	}
+
 	/* remove the last (biggest) unacked seqno when list is too large */
 	if (tp_vars->common.unacked_count > BATADV_TP_MAX_UNACKED) {
 		un = list_last_entry(&tp_vars->common.unacked_list,
diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
index e1463a029e83..c2ab00d8ef16 100644
--- a/net/batman-adv/types.h
+++ b/net/batman-adv/types.h
@@ -1332,7 +1332,7 @@ struct batadv_tp_unacked {
 	u32 seqno;
 
 	/** @len: length of the packet */
-	u16 len;
+	u32 len;
 
 	/** @list: list node for &batadv_tp_vars_common.unacked_list */
 	struct list_head list;