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[Charles Kerr <charles.kerr@xxxxxxxxxxxxx>]

The crash occurred when convertActionText() was passed a nullptr from
convertToEntry(), whose nullptr 'action' argument came from
ItemStore::search looping over its m_items and passing in
it->value()->action().

It looks like Item::action()'s implementation explicitly returns nullptr
in extreme cases, so we should probably add a nullptr safeguard to
convertActionText() and fix convertToEntry() to avoid empty strings
between the "||" delimiters.

** Information type changed from Private to Public

** Changed in: hud (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1292237

Title:
  hud-service crashed with SIGSEGV in data()

Status in “hud” package in Ubuntu:
  Triaged

Bug description:
  Don't know how it happened, crash warning just poped up...

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: hud 13.10.1+14.04.20140218.2-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
  Uname: Linux 3.13.0-17-generic x86_64
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Thu Mar 13 22:45:46 2014
  ExecutablePath: /usr/lib/x86_64-linux-gnu/hud/hud-service
  InstallationDate: Installed on 2013-02-03 (403 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  ProcCmdline: /usr/lib/x86_64-linux-gnu/hud/hud-service
  SegvAnalysis:
   Segfault happened at: 0x7f31049cadc1 <_ZNK7QAction4textEv+1>:	mov    0x8(%rsi),%rsi
   PC (0x7f31049cadc1) ok
   source "0x8(%rsi)" (0x00000008) not located in a known VMA region (needed readable region)!
   destination "%rsi" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: hud
  StacktraceTop:
   QAction::text() const () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
   ?? ()
   ?? ()
   hud::service::ItemStore::search(QString const&, QList<hud::service::Result>&) ()
   hud::service::QueryImpl::refresh() ()
  Title: hud-service crashed with SIGSEGV in QAction::text()
  UpgradeStatus: Upgraded to trusty on 2014-02-13 (28 days ago)
  UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo www-data

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