D20604: Fix stack-buffer-overflow read on malformed files

[Albert Astals Cid]

aacid created this revision.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
aacid requested review of this revision.

REVISION SUMMARY
  Make sure we read at most 32 bytes for the user/group
  
  oss-fuzz #14264

REPOSITORY
  R243 KArchive

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20604

AFFECTED FILES
  src/ktar.cpp

To: aacid
Cc: kde-frameworks-devel, michaelh, ngraham, bruns
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