[Tcl-bugs] [ tktoolkit-Bugs-734361 ] crash in PolygonToPostscript with 2 identical points

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Bugs item #734361, was opened at 2003-05-07 16:27
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Category: 06. Canvas Postscript
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Chris Waters (xtifr)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: crash in PolygonToPostscript with 2 identical points

Initial Comment:
Forwarded bug report from Debian Project, submitted
(with patch) by  Andreas Wilm
<wi...@ru...> (for original
report, see http://bugs.debian.org/192302):

"Create a polygon with two identical points and no
outline color (I know this seems to be nonsense, but in
my case it was absolutely needed). Do a postscript
command on the canvas and you get the core dump (a
color NULL pointer is passed on from
PolygonToPostscript to Tk_PostscriptColor, where it is
referenced)."

To reproduce:

% canvas .c
% pack .c
% .c create polygon 10 20 10 20
% .c postscript

Debian maintainer comments: I can reproduce the crash
on 8.3.5 and 8.4.2. I haven't tested the patch, but it
looks straightforward enough.  The scenario may seem
odd, but it's the kind of thing that could easily arise
programatically, i,.e., graphing some data that
includes some degenerate cases.  Arguably a minor
problem, but it should not segfault!

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