# HG changeset patch
# User Yexo <Yexo@openttd.org>
# Date 1232583817 0
# Node ID 54ff22c7986f0923858b65c39ecc8f801411e435
# Parent  eede61d2681e8563deaf2db589e8147134e960b9
(svn r15203) -Fix (r15190): CmdTerraformLand didn't check it's parameters good enough.

diff --git a/src/terraform_cmd.cpp b/src/terraform_cmd.cpp
--- a/src/terraform_cmd.cpp
+++ b/src/terraform_cmd.cpp
@@ -240,21 +240,21 @@
 	ts.modheight_count = ts.tile_table_count = 0;
 
 	/* Compute the costs and the terraforming result in a model of the landscape */
-	if ((p1 & SLOPE_W) != 0) {
+	if ((p1 & SLOPE_W) != 0 && tile + TileDiffXY(1, 0) < MapSize()) {
 		TileIndex t = tile + TileDiffXY(1, 0);
 		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
 		if (CmdFailed(cost)) return cost;
 		total_cost.AddCost(cost);
 	}
 
-	if ((p1 & SLOPE_S) != 0) {
+	if ((p1 & SLOPE_S) != 0 && tile + TileDiffXY(1, 1) < MapSize()) {
 		TileIndex t = tile + TileDiffXY(1, 1);
 		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
 		if (CmdFailed(cost)) return cost;
 		total_cost.AddCost(cost);
 	}
 
-	if ((p1 & SLOPE_E) != 0) {
+	if ((p1 & SLOPE_E) != 0 && tile + TileDiffXY(0, 1) < MapSize()) {
 		TileIndex t = tile + TileDiffXY(0, 1);
 		CommandCost cost = TerraformTileHeight(&ts, t, TileHeight(t) + direction);
 		if (CmdFailed(cost)) return cost;