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Constrain surfaceStyle value to valid range

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This commit is contained in:
Michał Janiszewski
2017-01-02 17:11:23 +01:00
committed by Ted John
parent 3e70ea9520
commit cbef2c8a29
1 changed files with 7 additions and 1 deletions
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8
src/world/map.c
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@@ -1581,7 +1581,13 @@ static money32 map_change_surface_style(int x0, int y0, int x1, int y1, uint8 su
(mapElement->properties.surface.terrain >> 5);
if (surfaceStyle != cur_terrain) {
surfaceCost += TerrainPricing[surfaceStyle & 0x1F];
// Prevent network-originated value of surfaceStyle from causing
// invalid access.
uint8 style = surfaceStyle & 0x1F;
if (style >= countof(TerrainPricing)) {
return MONEY32_UNDEFINED;
}
surfaceCost += TerrainPricing[style];
if (flags & 1){
mapElement->properties.surface.terrain &= MAP_ELEMENT_WATER_HEIGHT_MASK;
mapElement->type &= MAP_ELEMENT_QUADRANT_MASK | MAP_ELEMENT_TYPE_MASK;