Merge branch 'jej-fix-missing-access-check-on-issues' into 'security'

Fix missing access checks on issue lookup using IssuableFinder

Split from !2024 to partially solve https://gitlab.com/gitlab-org/gitlab-ce/issues/23867

:warning: - Potentially untested
:bomb: - No test coverage
:traffic_light: - Test coverage of some sort exists (a test failed when error raised)
:vertical_traffic_light: - Test coverage of return value (a test failed when nil used)
:white_check_mark: - Permissions check tested

- [x] :white_check_mark: app/controllers/projects/branches_controller.rb:39
  - `before_action :authorize_push_code!` helpes limit/prevent exploitation. Always checks for reporter access so fine with
    confidential issues, issues only visible to team, etc.
- [x] :traffic_light: app/models/cycle_analytics/summary.rb:9 [`.count`]
- [x] :white_check_mark: app/controllers/projects/todos_controller.rb:19

- [x] Potential double render in app/controllers/projects/todos_controller.rb

- https://dev.gitlab.org/gitlab/gitlabhq/merge_requests/2024/diffs#cedccb227af9bfdf88802767cb58d43c2b977439_24_24

See merge request !2030

1 files changed, 1 insertions, 7 deletions

diff --git a/app/controllers/projects/todos_controller.rb b/app/controllers/projects/todos_controller.rb
index 5685d0f4e7c..52517381c65 100644
--- a/app/controllers/projects/todos_controller.rb
+++ b/app/controllers/projects/todos_controller.rb
@@ -16,13 +16,7 @@ class Projects::TodosController < Projects::ApplicationController
     @issuable ||= begin
       case params[:issuable_type]
       when "issue"
-        issue = @project.issues.find(params[:issuable_id])
-
-        if can?(current_user, :read_issue, issue)
-          issue
-        else
-          render_404
-        end
+        IssuesFinder.new(current_user, project_id: @project.id).find(params[:issuable_id])
       when "merge_request"
         @project.merge_requests.find(params[:issuable_id])
       end