pool: guard against overflow

src/pool.c

@@ -19,7 +19,8 @@ APool *apool_create_ex(Allocator *allocator, U32 n_elements, U32 element_size, U
     pool->start = NULL;
 
     if (size != APOOL_AUTOGROW) {
-        U32 total_size = n_elements * size; // Note(nos): guard against unreasonable sizes
+        Assert(n_elements <= U32_Max / size );
+        U32 total_size = n_elements * size;
         U8 * start = allocator_push(allocator, total_size, align);
         for (U32 i = 0; i < total_size; i += size) {
             APoolElement *element = (APoolElement *)&start[i];
@@ -47,6 +48,8 @@ void *apool_alloc(APool *pool)
 void apool_free(APool *pool, void *ptr)
 {
     if (ptr != NULL) {
+        Assert((U8 *)ptr >= pool->start);
+
         APoolElement *element = (APoolElement *)ptr;
         element->next = pool->free_list;
         pool->free_list = element;