IconInfo iconInfo: member call on null pointer

[Scott Kostyshak]

On Sat, Sep 25, 2021 at 01:08:56PM +0200, Kornel Benko wrote:
> Am Fri, 24 Sep 2021 23:20:51 -0400
> schrieb Scott Kostyshak <skostysh at lyx.org>:
> 
> > After building with fsanitize=undefined -fno-omit-frame-pointer, I get the following:
> > 
> > $ cd lib/examples/ && lyx -e pdf Welcome.lyx
> > /home/scott/lyxbuilds/master/repo/src/frontends/qt/GuiApplication.cpp:558:55: runtime
> > error: member call on null pointer of type 'struct
> > GuiApplication' /home/scott/lyxbuilds/master/repo/src/frontends/qt/GuiApplication.cpp:558:55:
> > runtime error: member access within null pointer of type 'struct GuiApplication'
> > 
> > After that, LyX gives a backtrace and crashes. I attach the backtrace in case it's
> > useful.
> > 
> > Just for informational purposes (I'm not proposing this as a patch), the following does
> > fix the error:
> > 
> > diff --git a/src/frontends/qt/GuiApplication.cpp b/src/frontends/qt/GuiApplication.cpp
> > index 01a646de37..b93c4753c7 100644
> > --- a/src/frontends/qt/GuiApplication.cpp
> > +++ b/src/frontends/qt/GuiApplication.cpp
> > @@ -555,6 +555,8 @@ IconInfo iconInfo(FuncRequest const & f, bool unknown, bool rtl)
> >         if (unknown)
> >                 names << "unknown";
> >  
> > +       if (!theGuiApp())
> > +           return res;
> >         search_mode const mode = theGuiApp()->imageSearchMode();
> >         // The folders where icons are searched for
> >         QStringList imagedirs;
> > 
> > Scott
> 
> Why not? Looks perfect to me. But probably not the only place.

Because I don't understand what the code does. Can a different PDF be produced if the export is from the command line instead of from the GUI?

Scott
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