John Baldwin 9f745f61b8 Grab a reference on the matching interface address (ifa) in the handling
of the SIOC[DG]LIFADDR icotls before dropping the IF_ADDR_LOCK() and
release the reference after using it.  This prevents the address from
being potentially freed out from under the ioctl handler.

Reviewed by:	bz
MFC after:	1 week
2012-01-03 19:44:36 +00:00
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