NULL ptr dereference in TextSelectionPainter::hasGlyphLessFont() with certain PDF

[Enrik Berkhan]

When viewing a certain PDF (which I unfortunately can't share) using evince, a see a crash in libpoppler90. It's a NULL pointer dereference in TextSelectionPainter::hasGlyphLessFont(), because in this certain PDF, for whatever reason, sel->word->getFontName(0) may return NULL.

Attached you'll find a proposed patch increasing the robustness in this case.

Cheers,
Enrik

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Fixes a possible NULL ptr dereference in TextSelectionPainter::hasGlyphLessFont()" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mue Fom (2a4b172045b63c84177f9ffd0b6a8939)]

Please find attached a sample PDF demonstrating the problem.

It was produced by pdflatex on this file:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% -*- compile-command: "pdflatex t1-test && evince t1-test.pdf" -*-
\documentclass[12pt,a4paper]{article}

% \usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}

\begin{document}

Just a little test:

Try to select some text in evince!

\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

[Mue Fom (2a4b172045b63c84177f9ffd0b6a8939)]

Bug was introduced by LP #1830473 (Does not handle glyphless fonts, as used by tesseract)

[Julian Andres Klode (juliank)]

This is a duplicate of bug 1849773