diff --git a/drivers/thunderbolt/eeprom.c b/drivers/thunderbolt/eeprom.c
index 5681c17f82ec..2a13fa6888ba 100644
--- a/drivers/thunderbolt/eeprom.c
+++ b/drivers/thunderbolt/eeprom.c
@@ -394,9 +394,16 @@ static int tb_drom_parse_entry_port(struct tb_switch *sw,
 			return -EIO;
 		}
 		port->link_nr = entry->link_nr;
-		if (entry->has_dual_link_port)
+		if (entry->has_dual_link_port) {
+			if (entry->dual_link_port_nr > sw->config.max_port_number) {
+				tb_sw_warn(sw,
+					"port entry has invalid dual link port number %u\n",
+					entry->dual_link_port_nr);
+				return -EIO;
+			}
 			port->dual_link_port =
 				&port->sw->ports[entry->dual_link_port_nr];
+		}
 	}
 	return 0;
 }