[bug #38680] Crash when observing notifications via a forwarded selector

[Wolfgang Lux]

URL:
  <http://savannah.gnu.org/bugs/?38680>

                 Summary: Crash when observing notifications via a forwarded
selector
                 Project: GNUstep
            Submitted by: wlux
            Submitted on: So 07 Apr 2013 10:18:31 GMT
                Category: Base/Foundation
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

I have recently stumbled across this nasty bug when using the StepTalk
framework to handle notifications in a script.
The attached test program crashes under GNUstep when the notification is
posted. I had a tough time tracking this bug down. It happens because when an
observer is registered the notification center saves the method's
implementation. As -test: is a forwarded method, the code for
-methodForSelector: returns a fresh closure by calling cifframe_closure. But
this closure is allocated in an autoreleased memory block, so at the time the
notification is posted, the closure is no longer valid and the closure's code
has been overwritten by some random data.
Incidentally, the test program works fine under OS X.



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File Attachments:


-------------------------------------------------------
Date: So 07 Apr 2013 10:18:31 GMT  Name: GNUmakefile  Size: 192B   By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=27803>
-------------------------------------------------------
Date: So 07 Apr 2013 10:18:31 GMT  Name: main.m  Size: 3kB   By: wlux

<http://savannah.gnu.org/bugs/download.php?file_id=27804>

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  <http://savannah.gnu.org/bugs/?38680>

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