[okular] [Bug 420656] New: segfault when opening some pdfs

[Gaëtan Gilbert]

https://bugs.kde.org/show_bug.cgi?id=420656

            Bug ID: 420656
           Summary: segfault when opening some pdfs
           Product: okular
           Version: 1.9.3
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: gaetan.gilbert at skyskimmer.net
  Target Milestone: ---

Created attachment 127917
  --> https://bugs.kde.org/attachment.cgi?id=127917&action=edit
segfaulting pdf

SUMMARY

I have a few pdfs on which okular crashes with a segfault.
All of them are from the same source (Inria), I tried random other pdfs which
all worked fine.

Other programs (the other pdfs always worked fine):
- evince opens them without issue
- the calibre ebook viewer fails to open and says "failed to initialize plugin
DeDRM [some trace] UnicodeEncodeError: 'utf-8' codec can't encode character
'\udc90' in position 6: surrogates not allowed"
- libreoffice says "the signature is OK but the certificate could not be
validated", clicking "show signatures" makes it complain about non existing
XXXX.tmp files in the pdf's directory

So the issue seems linked to signatures but I don't know enough about how that
stuff works to be sure.

STEPS TO REPRODUCE
1. open attached file
2. witness crash

OBSERVED RESULT

crash

EXPECTED RESULT

view pdf

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: linux 3.3.0-2-amd64
(available in About System)
KDE Plasma Version: 5.17.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.5

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