BIND 10 #1783: auth could cause duplicate buffer free on exception

[BIND 10 Development]

#1783: auth could cause duplicate buffer free on exception
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  high          |                    Milestone:
           Component:  b10-auth      |  Sprint-20120320
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  auth
         Total Hours:  0             |  performance
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 While looking into a regression due to #1600
 (http://bind10.isc.org/ticket/1600#comment:36),
 I noticed the deferred task of providing stronger exception guarantee
 was more serious - in fact it would be a more fundamental exception
 safety issue: if toWire() fails in processNotify() with an exception,
 the renderer holds the buffer until the next query, but in the case of
 TCP it might have been already deleted by the DNS server object.
 So it could lead to a duplicate free (that should be happening in the
 regression, btw).

 So I'm going to fix the issue right now.

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Ticket URL: <http://bind10.isc.org/ticket/1783>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development