Avoid teleporting player if /teleport coords are out-of-range

builtin/game/chatcommands.lua

@@ -352,10 +352,16 @@ core.register_chatcommand("teleport", {
 		p.x = tonumber(p.x)
 		p.y = tonumber(p.y)
 		p.z = tonumber(p.z)
-		teleportee = core.get_player_by_name(name)
-		if teleportee and p.x and p.y and p.z then
-			teleportee:setpos(p)
-			return true, "Teleporting to "..core.pos_to_string(p)
+		if p.x and p.y and p.z then
+			local lm = tonumber(minetest.setting_get("map_generation_limit") or 31000)
+			if p.x < -lm or p.x > lm or p.y < -lm or p.y > lm or p.z < -lm or p.z > lm then
+				return false, "Cannot teleport out of map bounds!"
+			end
+			teleportee = core.get_player_by_name(name)
+			if teleportee then
+				teleportee:setpos(p)
+				return true, "Teleporting to "..core.pos_to_string(p)
+			end
 		end
 
 		local teleportee = nil