Fix

Author: danog

Zend/zend_alloc.c

@@ -1993,6 +1993,7 @@ static zend_always_inline void *zend_mm_realloc_heap(zend_mm_heap *heap, void *p
 						ret = zend_mm_alloc_small(heap, ZEND_MM_SMALL_SIZE_TO_BIN(size) ZEND_FILE_LINE_RELAY_CC ZEND_FILE_LINE_ORIG_RELAY_CC);
 						copy_size = use_copy_size ? MIN(size, copy_size) : size;
 						ZEND_MM_UNPOISON(ret, size);
+						ZEND_MM_UNPOISON(ptr, copy_size);
 						memcpy(ret, ptr, copy_size);
 						zend_mm_free_small(heap, ptr, old_bin_num);
 					} else {