[Octave-bug-tracker] [bug #55736] Segfault when copying source file text to clipboard in octave-gui

[anonymous]

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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