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Fix #7593: Crash in ScriptOrder::GetOrderDistance in VT_AIR mode 

Null pointer dereference occurred when either origin_tile or dest_tile
were waypoint tiles.
This commit is contained in:
Jonathan G Rennison 2019-05-23 22:40:34 +01:00 committed by Charles Pigott
parent 5981ed248a
commit d71a7c21da
1 changed files with 8 additions and 2 deletions
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10
src/script/api/script_order.cpp
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@ -669,8 +669,14 @@ static void _DoCommandReturnSetOrderFlags(class ScriptInstance *instance)
/* static */ uint ScriptOrder::GetOrderDistance(ScriptVehicle::VehicleType vehicle_type, TileIndex origin_tile, TileIndex dest_tile)
{
if (vehicle_type == ScriptVehicle::VT_AIR) {
if (ScriptTile::IsStationTile(origin_tile) && ::Station::GetByTile(origin_tile)->airport.tile != INVALID_TILE) origin_tile = ::Station::GetByTile(origin_tile)->airport.tile;
if (ScriptTile::IsStationTile(dest_tile) && ::Station::GetByTile(dest_tile)->airport.tile != INVALID_TILE) dest_tile = ::Station::GetByTile(dest_tile)->airport.tile;
if (ScriptTile::IsStationTile(origin_tile)) {
Station *orig_station = ::Station::GetByTile(origin_tile);
if (orig_station != nullptr && orig_station->airport.tile != INVALID_TILE) origin_tile = orig_station->airport.tile;
}
if (ScriptTile::IsStationTile(dest_tile)) {
Station *dest_station = ::Station::GetByTile(dest_tile);
if (dest_station != nullptr && dest_station->airport.tile != INVALID_TILE) dest_tile = dest_station->airport.tile;
}
return ScriptMap::DistanceSquare(origin_tile, dest_tile);
} else {