Merge pull request #3160 from silverflyone/develop

Fix to read access violation in StockpileIterator::operator++

docs/changelog.txt

@@ -39,6 +39,7 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 - `hotkeys`: hotkey hints on menu popup will no longer get their last character cut off by the scrollbar
 - ``launchdf``: launch Dwarf Fortress via the Steam client so Steam Workshop is functional
 - `blueprint`: interpret saplings, shrubs, and twigs as floors instead of walls
+- `combine`: fix error processing stockpiles with boundaries that extend outside of the map
 
 ## Misc Improvements
 - `buildingplan`: items in the item selection dialog should now use the same item quality symbols as the base game

library/modules/Buildings.cpp

@@ -1645,19 +1645,25 @@ StockpileIterator& StockpileIterator::operator++() {
         if (block) {
             // Check the next item in the current block.
             ++current;
+        }
+        else if (stockpile->x2 < 0 || stockpile->y2 < 0 || stockpile->z < 0 || stockpile->x1 > world->map.x_count - 1 || stockpile->y1 > world->map.y_count - 1 || stockpile->z > world->map.z_count - 1) {
+            // if the stockpile bounds exist outside of valid map plane then no items can be in the stockpile
+            block = NULL;
+            item = NULL;
+            return *this;
         } else {
             // Start with the top-left block covering the stockpile.
-            block = Maps::getTileBlock(stockpile->x1, stockpile->y1, stockpile->z);
+            block = Maps::getTileBlock(std::min(std::max(stockpile->x1, 0), world->map.x_count-1), std::min(std::max(stockpile->y1, 0), world->map.y_count-1), stockpile->z);
             current = 0;
         }
 
         while (current >= block->items.size()) {
             // Out of items in this block; find the next block to search.
-            if (block->map_pos.x + 16 <= stockpile->x2) {
+            if (block->map_pos.x + 16 <= std::min(stockpile->x2, world->map.x_count-1)) {
                 block = Maps::getTileBlock(block->map_pos.x + 16, block->map_pos.y, stockpile->z);
                 current = 0;
-            } else if (block->map_pos.y + 16 <= stockpile->y2) {
+            } else if (block->map_pos.y + 16 <= std::min(stockpile->y2, world->map.y_count-1)) {
-                block = Maps::getTileBlock(stockpile->x1, block->map_pos.y + 16, stockpile->z);
+                block = Maps::getTileBlock(std::max(stockpile->x1, 0), block->map_pos.y + 16, stockpile->z);
                 current = 0;
             } else {
                 // All items in all blocks have been checked.