Fix a potential overflow from large stacks

This was hitting in the tests. It only matters on platforms where long is 32 bits, so had been missed before.
CleverRaven · Oct 31, 2018 · 52696ff · 52696ff
1 parent 3529460
commit 52696ff
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/item.cpp b/src/item.cpp
@@ -3038,7 +3038,7 @@ units::volume item::volume( bool integral ) const
     }
 
     if( count_by_charges() || made_of( LIQUID ) ) {
-        auto num = ret * charges;
+        auto num = ret * static_cast<int64_t>( charges );
         ret = num / type->stack_size;
         if( num % type->stack_size != 0_ml ) {
             ret += 1_ml;