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[Octave-bug-tracker] [bug #55736] Segfault when copying source file text

From: anonymous
Subject: [Octave-bug-tracker] [bug #55736] Segfault when copying source file text to clipboard in octave-gui
Date: Tue, 19 Feb 2019 17:44:54 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0

Follow-up Comment #9, bug #55736 (project octave):

I applied 3d0f687e4a21 to Octave 5.0.91-7b9a5ab8350f, compiled against qt4. 
Running "octave --gui" crashes immediately with a segfault in
QHelpEngine::contentWidget(), called from documentation::documentation() in
documentation.cc, line 178.
This line delimits m_help_engine, and m_help_engine is NULL: thus the
segfault.  This is unsurprising since the applied patch sets m_help_engine to
NULL in the case where setupData() fails.

Since m_help_engine is used to create a number of other objects (content for
example) which are then also dereferenced in the lines following 178, it's
clear that a fix for this is not as simple as the addition of a single NULL
test on m_help_engine at line 178.


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