Fixed memory leaks caused by exceptions thrown from destructors (one more case).

Author: dstogov

Zend/zend_vm_def.h

@@ -7798,6 +7798,7 @@ ZEND_VM_HANDLER(157, ZEND_FETCH_CLASS_NAME, ANY, ANY, CLASS_FETCH)
 		zend_throw_error(NULL, "Cannot use \"%s\" when no class scope is active",
 			fetch_type == ZEND_FETCH_CLASS_SELF ? "self" :
 			fetch_type == ZEND_FETCH_CLASS_PARENT ? "parent" : "static");
+		ZVAL_UNDEF(EX_VAR(opline->result.var));
 		HANDLE_EXCEPTION();
 	}
 
@@ -7809,6 +7810,7 @@ ZEND_VM_HANDLER(157, ZEND_FETCH_CLASS_NAME, ANY, ANY, CLASS_FETCH)
 			if (UNEXPECTED(scope->parent == NULL)) {
 				zend_throw_error(NULL,
 					"Cannot use \"parent\" when current class scope has no parent");
+				ZVAL_UNDEF(EX_VAR(opline->result.var));
 				HANDLE_EXCEPTION();
 			}
 			ZVAL_STR_COPY(EX_VAR(opline->result.var), scope->parent->name);

Zend/zend_vm_execute.h

@@ -1908,6 +1908,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_FETCH_CLASS_NAME_SPEC_HANDLER(
 		zend_throw_error(NULL, "Cannot use \"%s\" when no class scope is active",
 			fetch_type == ZEND_FETCH_CLASS_SELF ? "self" :
 			fetch_type == ZEND_FETCH_CLASS_PARENT ? "parent" : "static");
+		ZVAL_UNDEF(EX_VAR(opline->result.var));
 		HANDLE_EXCEPTION();
 	}
 
@@ -1919,6 +1920,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_FETCH_CLASS_NAME_SPEC_HANDLER(
 			if (UNEXPECTED(scope->parent == NULL)) {
 				zend_throw_error(NULL,
 					"Cannot use \"parent\" when current class scope has no parent");
+				ZVAL_UNDEF(EX_VAR(opline->result.var));
 				HANDLE_EXCEPTION();
 			}
 			ZVAL_STR_COPY(EX_VAR(opline->result.var), scope->parent->name);