fail before make any changes

Author: 6543

services/repository/transfer.go

@@ -5,6 +5,8 @@
 package repository
 
 import (
+	"fmt"
+
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/notification"
 	"code.gitea.io/gitea/modules/sync"
@@ -20,6 +22,11 @@ func TransferOwnership(doer, newOwner *models.User, repo *models.Repository, tea
 	if err := repo.GetOwner(); err != nil {
 		return err
 	}
+	for _, team := range teams {
+		if newOwner.ID != team.OrgID {
+			return fmt.Errorf("team %d does not belong to organization", team.ID)
+		}
+	}
 
 	oldOwner := repo.Owner