- Argh, the suffering copy&paste can cause

Zend/zend_mm.c

@@ -391,7 +391,7 @@ void *zend_mm_realloc(zend_mm_heap *heap, void *p, size_t size)
 				zend_mm_remove_from_free_list(heap, (zend_mm_free_block *) next_block);
 				new_next_block->size += next_block->size;
 				/* update the next block's prev_size */
-				ZEND_MM_BLOCK_AT(mm_block, new_next_block->size)->prev_size = new_next_block->size;
+				ZEND_MM_BLOCK_AT(new_next_block, new_next_block->size)->prev_size = new_next_block->size;
 				zend_mm_add_to_free_list(heap, (zend_mm_free_block *) new_next_block);
 			}
 		}