D20877: Fix exivextractor crash with malformed files

[Alexander Stippich]

astippich created this revision.
Herald added projects: Frameworks, Baloo.
Herald added subscribers: Baloo, kde-frameworks-devel.
astippich requested review of this revision.

REVISION SUMMARY
  Prevent a segfault by explicitly checking everywhere
  for valid entries.
  
  BUG: 405210

REPOSITORY
  R286 KFileMetaData

BRANCH
  fix_exiv_crash

REVISION DETAIL
  https://phabricator.kde.org/D20877

AFFECTED FILES
  src/extractors/exiv2extractor.cpp

To: astippich
Cc: kde-frameworks-devel, #baloo, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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