[Pkg-tcltk-devel] Bug#465462: Bug#465462: Bug#465462: Bug#465462: Bug#465462:/usr/bin/wish8.5: segfault for wish

[Techentin, Robert]

> For me it looks very strange that tkFontPtr is NULL in #2 and 
> fontPtr is not NULL in #1. The relevant code is:

Gcc isn't my usual tool chain, but I can make a guess.

#2:  It looks like TkpGetFontFromAttributes calls InitFont with
fontPtr=0.

#1:  Inside InitFont, the first thing it does is check fontPtr==0, then
call ckAlloc().  So now fontPtr is non-zero, which you see as the stack
unwinds.

It look like the real problem is in InitFont, where it calls GetFont()
which is returning a zero for ftFont.  When GetTkFontAttributes tries to
dereference it, you get the segfault.  Just like the bug report (Joe
referenced) says.  I don't know enough about the code to create an
elegant recovery mechanism.

Bob
-- 
Bob Techentin                        techentin.robert at mayo.edu 
Mayo Foundation                                 (507) 538-5495 
200 First St. SW                            FAX (507) 284-9171
Rochester MN, 55901  USA            http://www.mayo.edu/sppdg/