Initialize capacity to 0 when allocating a new cell

Otherwise, when later we do cell.capacity == 0 we're using uninitialized
memory and can return the wrong result if we're not lucky enough to get 0s.

diff --git a/gc/gc.d b/gc/gc.d
index 3ee81ac..a7c8f59 100644 (file)
--- a/gc/gc.d
+++ b/gc/gc.d
@@ -533,6 +533,7 @@ public:
 
         // No luck still, allocate new memory
         cell = cast(Cell*) cstdlib.malloc(size + Cell.sizeof);
+        cell.capacity = 0; // so we can later tell it's new
         if (cell)
             goto success;