[asterisk-dev] [Code Review] Give zombies a safe channel driver to use.

[rmudgett]

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Review request for Asterisk Developers, Russell Bryant and David Vossel.


Summary
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Recent crashes from zombie channels suggests that they need a safe home to goto.

When a masquerade happens, the physical part of the zombie channel is hungup.  The hangup normally sets the channel private pointer to NULL.  If someone then blindly does a callback to the channel driver, a crash is likely because the private pointer is NULL.

The masquerade now sets the channel technology of zombie channels to the NULL channel driver.


This addresses bugs 19116 and 19310.
    https://issues.asterisk.org/view.php?id=19116
    https://issues.asterisk.org/view.php?id=19310


Diffs
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  /branches/1.8/include/asterisk/channel.h 320060 
  /branches/1.8/main/channel.c 320060 
  /branches/1.8/main/features.c 320060 

Diff: https://reviewboard.asterisk.org/r/1224/diff


Testing
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Tested a version of this patch without the zombie check committed for issue 19116.  The crash was avoided.


Thanks,

rmudgett

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