- limit size of buffers to RPC_MAXDATASIZE
- don't leak memory
- be more picky about bad parameters
From:
https://raw.githubusercontent.com/guidovranken/rpcbomb/master/libtirpc_patch.txt
https://github.com/guidovranken/rpcbomb/blob/master/rpcbind_patch.txt
via NetBSD.
Reviewed by: emaste, cem (earlier version)
Differential Revision: https://reviews.freebsd.org/D10922
MFC after: 3 days