[Poppler-bugs] [Bug 24332] evince crashed with SIGSEGV in TextWord::TextWord()

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=24332





--- Comment #3 from Dennis Sheil <dsheil at vartmp.com>  2009-12-19 01:28:40 PST ---
I have been looking at this bug.  I wrote a little about it here -
http://www.vartmp.com/blog/subjects/poppler/20091219.html

The segmentation fault happens when the TextWord constructor is called. 
Specifically, when the constructor is called from the beginWord method. The
reason the segmentation fault happens is because the curFont object has not
been created prior to this, despite it being one of the parameters sent to the
TextWord constructor.

On the basis of seeing this, I did a four-line hack in the beginWord method
that checks for the existence of curFont, and if it does not exist, creates it
and then calls "fonts->append(curFont)".  After this, evince stopped crashing
on the pages of the PDFs that it has been crashing (segfaulting) on.

However, I have not really looked into this indepth, what I did was just a
hack.  I am looking through the code of evince and poppler right now, and
recreating the segfaults.  It is possible that there is a better way to solve
this, perhaps creating the curFont object in a different method, or who knows. 
If I come up with something better I'll give you an update.  Or if one of you
see something better that's good too.


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