Fixed coredump due to abnormal implemention of phar

Author: laruence

ext/phar/util.c

@@ -1187,7 +1187,8 @@ phar_entry_info * phar_open_jit(phar_archive_data *phar, phar_entry_info *entry,
 
 PHP_PHAR_API int phar_resolve_alias(char *alias, int alias_len, char **filename, int *filename_len TSRMLS_DC) /* {{{ */ {
 	phar_archive_data **fd_ptr;
-	if (SUCCESS == zend_hash_find(&(PHAR_GLOBALS->phar_alias_map), alias, alias_len, (void**)&fd_ptr)) {
+	if (PHAR_GLOBALS->phar_alias_map.arBuckets
+			&& SUCCESS == zend_hash_find(&(PHAR_GLOBALS->phar_alias_map), alias, alias_len, (void**)&fd_ptr)) {
 		*filename = (*fd_ptr)->fname;
 		*filename_len = (*fd_ptr)->fname_len;
 		return SUCCESS;