CVS commit: src/sys/netinet

["Maxime Villard" <maxv%netbsd.org@localhost>]

Module Name:    src
Committed By:   maxv
Date:           Thu Feb  8 06:50:38 UTC 2018

Modified Files:
        src/sys/netinet: udp_usrreq.c

Log Message:
Fix three pretty bad mistakes in NAT-T:

 * If we got a keepalive packet, we need to call m_freem, not m_free.
   Here the next mbufs in the chain are not freed. Seems easy to remotely
   DoS the system by sending fragmented keepalives in a loop.

 * If !ipsec_used, free the mbuf.

 * In udp_input, we need to update 'uh', because udp4_realinput may have
   modified the chain. Perhaps we also need to re-enforce alignment, so
   add an XXX.


To generate a diff of this commit:
cvs rdiff -u -r1.236 -r1.237 src/sys/netinet/udp_usrreq.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.