freenode
/kline parses strange cidr masks as their upper limits instead of rejecting
See #111 and its fix, #112 .
We should probably reject these klines rather than the current safe-but-incorrect behaviour.
As mentioned in #112, the main issue right now is that the parse_netmask() function used in src/hostmask.c returns only varying kinds of success, and has no way to indicate failure. Some work will need to go into updating the calling code of these functions to accept a failure value and do the right thing.
Also, per https://github.com/freenode/ircd-seven/pull/112#issuecomment-348018131,
There appears to be an integer underflow with large negative numbers (n-2^32). Example:
@1.2.3.4/-4294967296(n=0) matches all IPv4 on testnet.
