static PHP_MINIT_FUNCTION(zip)
{
#ifdef PHP_ZIP_USE_OO
	zend_class_entry ce;

	memcpy(&zip_object_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
 	zip_object_handlers.clone_obj		= NULL;
 	zip_object_handlers.get_property_ptr_ptr = php_zip_get_property_ptr_ptr;
 
 	zip_object_handlers.get_properties = php_zip_get_properties;
 	zip_object_handlers.read_property	= php_zip_read_property;
 	zip_object_handlers.has_property	= php_zip_has_property;

	INIT_CLASS_ENTRY(ce, "ZipArchive", zip_class_functions);
	ce.create_object = php_zip_object_new;
	zip_class_entry = zend_register_internal_class(&ce TSRMLS_CC);

	zend_hash_init(&zip_prop_handlers, 0, NULL, NULL, 1);
	php_zip_register_prop_handler(&zip_prop_handlers, "status",    php_zip_status, NULL, NULL, IS_LONG TSRMLS_CC);
	php_zip_register_prop_handler(&zip_prop_handlers, "statusSys", php_zip_status_sys, NULL, NULL, IS_LONG TSRMLS_CC);
	php_zip_register_prop_handler(&zip_prop_handlers, "numFiles",  php_zip_get_num_files, NULL, NULL, IS_LONG TSRMLS_CC);
	php_zip_register_prop_handler(&zip_prop_handlers, "filename", NULL, NULL, php_zipobj_get_filename, IS_STRING TSRMLS_CC);
	php_zip_register_prop_handler(&zip_prop_handlers, "comment", NULL, php_zipobj_get_zip_comment, NULL, IS_STRING TSRMLS_CC);

	REGISTER_ZIP_CLASS_CONST_LONG("CREATE", ZIP_CREATE);
	REGISTER_ZIP_CLASS_CONST_LONG("EXCL", ZIP_EXCL);
	REGISTER_ZIP_CLASS_CONST_LONG("CHECKCONS", ZIP_CHECKCONS);
	REGISTER_ZIP_CLASS_CONST_LONG("OVERWRITE", ZIP_OVERWRITE);

	REGISTER_ZIP_CLASS_CONST_LONG("FL_NOCASE", ZIP_FL_NOCASE);
	REGISTER_ZIP_CLASS_CONST_LONG("FL_NODIR", ZIP_FL_NODIR);
	REGISTER_ZIP_CLASS_CONST_LONG("FL_COMPRESSED", ZIP_FL_COMPRESSED);
	REGISTER_ZIP_CLASS_CONST_LONG("FL_UNCHANGED", ZIP_FL_UNCHANGED);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_DEFAULT", ZIP_CM_DEFAULT);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_STORE", ZIP_CM_STORE);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_SHRINK", ZIP_CM_SHRINK);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_REDUCE_1", ZIP_CM_REDUCE_1);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_REDUCE_2", ZIP_CM_REDUCE_2);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_REDUCE_3", ZIP_CM_REDUCE_3);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_REDUCE_4", ZIP_CM_REDUCE_4);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_IMPLODE", ZIP_CM_IMPLODE);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_DEFLATE", ZIP_CM_DEFLATE);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_DEFLATE64", ZIP_CM_DEFLATE64);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_PKWARE_IMPLODE", ZIP_CM_PKWARE_IMPLODE);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_BZIP2", ZIP_CM_BZIP2);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_LZMA", ZIP_CM_LZMA);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_TERSE", ZIP_CM_TERSE);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_LZ77", ZIP_CM_LZ77);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_WAVPACK", ZIP_CM_WAVPACK);
	REGISTER_ZIP_CLASS_CONST_LONG("CM_PPMD", ZIP_CM_PPMD);

	/* Error code */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_OK",			ZIP_ER_OK);			/* N No error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_MULTIDISK",	ZIP_ER_MULTIDISK);	/* N Multi-disk zip archives not supported */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_RENAME",		ZIP_ER_RENAME);		/* S Renaming temporary file failed */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_CLOSE",		ZIP_ER_CLOSE);		/* S Closing zip archive failed */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_SEEK",		ZIP_ER_SEEK);		/* S Seek error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_READ",		ZIP_ER_READ);		/* S Read error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_WRITE",		ZIP_ER_WRITE);		/* S Write error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_CRC",			ZIP_ER_CRC);		/* N CRC error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_ZIPCLOSED",	ZIP_ER_ZIPCLOSED);	/* N Containing zip archive was closed */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_NOENT",		ZIP_ER_NOENT);		/* N No such file */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_EXISTS",		ZIP_ER_EXISTS);		/* N File already exists */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_OPEN",		ZIP_ER_OPEN);		/* S Can't open file */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_TMPOPEN",		ZIP_ER_TMPOPEN);	/* S Failure to create temporary file */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_ZLIB",		ZIP_ER_ZLIB);		/* Z Zlib error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_MEMORY",		ZIP_ER_MEMORY);		/* N Malloc failure */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_CHANGED",		ZIP_ER_CHANGED);	/* N Entry has been changed */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_COMPNOTSUPP",	ZIP_ER_COMPNOTSUPP);/* N Compression method not supported */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_EOF",			ZIP_ER_EOF);		/* N Premature EOF */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_INVAL",		ZIP_ER_INVAL);		/* N Invalid argument */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_NOZIP",		ZIP_ER_NOZIP);		/* N Not a zip archive */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_INTERNAL",	ZIP_ER_INTERNAL);	/* N Internal error */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_INCONS",		ZIP_ER_INCONS);		/* N Zip archive inconsistent */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_REMOVE",		ZIP_ER_REMOVE);		/* S Can't remove file */
	REGISTER_ZIP_CLASS_CONST_LONG("ER_DELETED",  	ZIP_ER_DELETED);	/* N Entry has been deleted */

	php_register_url_stream_wrapper("zip", &php_stream_zip_wrapper TSRMLS_CC);
#endif

	le_zip_dir   = zend_register_list_destructors_ex(php_zip_free_dir,   NULL, le_zip_dir_name,   module_number);
	le_zip_entry = zend_register_list_destructors_ex(php_zip_free_entry, NULL, le_zip_entry_name, module_number);

	return SUCCESS;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.