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Subject: Re: PCB Use-after free bug [WAS: Re: [geda-user] PCB 2011-09-18 on
 WinXP - possible problems]
From: Peter Clifton <pcjc2 AT cam DOT ac DOT uk>
To: geda-user AT delorie DOT com
Cc: Andrew Poelstra <asp11 AT sfu DOT ca>
Date: Fri, 23 Sep 2011 01:37:18 +0100
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On Fri, 2011-09-23 at 01:01 +0100, Peter Clifton wrote:
> On Fri, 2011-09-23 at 00:27 +0100, Peter Clifton wrote:
> >=20
> > Could you file this for me at:
> >=20
> > http://launchpad.net/pcb/+filebug=20
>=20
> Never mind - I filed it myself:
>=20
> https://bugs.launchpad.net/pcb/+bug/856909

And now fixed ;)

Andrew - you might want to check and see if the Route Style selector
part of this fix was correct.

It is keeping pointers into the current "PCB" structure, and there is a
certain delay between where the PCB is free'd, and actions are called to
inform the GUI of this fact. (The problem here was an intervening call
which suggested the route styles had changed - when there was no current
board at all).

Another band-aid type workaround would be to avoid free'ing the old PCB
until we have a new one to replace it with - but if we have to do that,
its rather admitting that our code is very very fragile!

Best wishes,

--=20
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)
Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)

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