CVS commit: src/sys/netinet6

["Ryota Ozaki" <ozaki-r%netbsd.org@localhost>]

Module Name:    src
Committed By:   ozaki-r
Date:           Thu Nov 23 07:09:20 UTC 2017

Modified Files:
        src/sys/netinet6: in6.c

Log Message:
Fix a race condition of in6_ifinit

in6_ifinit checks the number of IPv6 addresses on a given interface and
if it's zero (i.e., an IPv6 address being assigned to the interface
is the first one), call if_addr_init. However, the actual assignment of
the address (ifa_insert) is out of in6_ifinit. The check and the
assignment must be done atomically.

Fix it by holding in6_ifaddr_lock during in6_ifinit and ifa_insert.
And also add missing pserialize to IFADDR_READER_FOREACH.


To generate a diff of this commit:
cvs rdiff -u -r1.253 -r1.254 src/sys/netinet6/in6.c

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