[Asterisk-Users] Please Explain newchan->pvt->pvt

[Matt Lawson]

I'm into my 4th or 5th day of working on bug #981.  I know that part of 
the problem is that the fixup routine is called in chan_sip.c.  Well in 
there is a line that says p=newchan->pvt->pvt.  Problem is, that doesn't 
exist in this case.

I see "pvt" described as "private lock" but that doesn't mean I have any 
clue what the ramifications are in this instance.  Of course I can 
easily put a check into fixup that says if p is NULL then return 
success.  But what does it *mean* if newchan->pvt->pvt is NULL?  What 
should be done in this case?

This situation happens (sometimes) when the "dual redirect" is used and 
it's in the process of transferring the original receipient.   i.e. A 
calls B, then you do the dual redirect.  Regardless of which parameter 
goes into "Channel" or "ExtraChannel", "B" is the one that will cause 
the crash, as it's going through the masquerade process.

Yes it is updated to cvs.