D12335: Avoid infinite loops when fetching the URL from DocumentUrlDB

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, michaelh.
Restricted Application added projects: Frameworks, Baloo.
Restricted Application added a subscriber: Frameworks.
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REVISION SUMMARY
  Some users apparently have DBs which contain infinite loops in the idTree
  (a parentId pointing to itself or one of its children). This manifests in
  either crashes due to exhausted memory and/or the process being stuck
  with 100% CPU load.
  
  The problem can only be completely solved by either recreating the DB, or
  by cleaning the DB from any problematic records. As in interim solution,
  stop the code from crashing.
  
  BUG: 378754
  CCBUG: 385846
  CCBUG: 391258
  CCBUG: 393181

REPOSITORY
  R293 Baloo

BRANCH
  db_robustness

REVISION DETAIL
  https://phabricator.kde.org/D12335

AFFECTED FILES
  src/engine/documenturldb.cpp

To: bruns, #baloo, michaelh
Cc: #frameworks, ashaposhnikov, michaelh, astippich, spoorun, bruns
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