Merge branch 'zj-fix-label-creation-non-members' into 'security'

Fix label creation non members

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/23416

See merge request !2006

2 files changed, 11 insertions, 4 deletions

diff --git a/app/services/issuable_base_service.rb b/app/services/issuable_base_service.rb
index 575795788de..617defd8fe8 100644
--- a/app/services/issuable_base_service.rb
+++ b/app/services/issuable_base_service.rb
@@ -85,14 +85,15 @@ class IssuableBaseService < BaseService
 
   def find_or_create_label_ids
     labels = params.delete(:labels)
+
     return unless labels
 
-    params[:label_ids] = labels.split(',').map do |label_name|
+    params[:label_ids] = labels.split(",").map do |label_name|
       service = Labels::FindOrCreateService.new(current_user, project, title: label_name.strip)
       label   = service.execute
 
-      label.id
-    end
+      label.try(:id)
+    end.compact
   end
 
   def process_label_ids(attributes, existing_label_ids: nil)
@@ -140,6 +141,7 @@ class IssuableBaseService < BaseService
 
     params.delete(:state_event)
     params[:author] ||= current_user
+
     label_ids = process_label_ids(params)
 
     issuable.assign_attributes(params)
diff --git a/app/services/labels/find_or_create_service.rb b/app/services/labels/find_or_create_service.rb
index d622f9edd33..cf4f7606c94 100644
--- a/app/services/labels/find_or_create_service.rb
+++ b/app/services/labels/find_or_create_service.rb
@@ -22,9 +22,14 @@ module Labels
       ).execute(skip_authorization: skip_authorization)
     end
 
+    # Only creates the label if current_user can do so, if the label does not exist
+    # and the user can not create the label, nil is returned
     def find_or_create_label
       new_label = available_labels.find_by(title: title)
-      new_label ||= project.labels.create(params)
+
+      if new_label.nil? && (skip_authorization || Ability.allowed?(current_user, :admin_label, project))
+        new_label = project.labels.create(params)
+      end
 
       new_label
     end