git: AF_UNIX: Hold a reference of the unp_conn before executing
commit 76d4bfa31c73732ae74b63f8fe1cbdc9d8df7a52
Author: Sepherosa Ziehau <sephe@dragonflybsd.org>
Date: Wed Apr 27 15:10:03 2011 +0800
AF_UNIX: Hold a reference of the unp_conn before executing blocking code
Since unp_token will be automaticly released upon execution of blocking
code, close of unp_conn could race any code paths that references unp_conn
after executing blocking code. To fix these races, we simply increment
the reference count of the unp_conn before executig any possibly blocking
code and release the reference count of unp_conn, which may release unp_conn
itself. This _currently_ does not suffer 0-ref race, since unp_token is
always being held.
Summary of changes:
sys/kern/uipc_usrreq.c | 77 ++++++++++++++++++++++++++++++++++++++++-------
sys/sys/unpcb.h | 2 +-
2 files changed, 66 insertions(+), 13 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/76d4bfa31c73732ae74b63f8fe1cbdc9d8df7a52
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