From owner-cvs-src-old@FreeBSD.ORG  Thu Dec 18 12:01:38 2008
Return-Path: <owner-cvs-src-old@FreeBSD.ORG>
Delivered-To: cvs-src-old@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id B8AE31065690
	for <cvs-src-old@freebsd.org>; Thu, 18 Dec 2008 12:01:38 +0000 (UTC)
	(envelope-from kib@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id A76558FC29
	for <cvs-src-old@freebsd.org>; Thu, 18 Dec 2008 12:01:38 +0000 (UTC)
	(envelope-from kib@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.3/8.14.3) with ESMTP id mBIC1cWb030081
	for <cvs-src-old@freebsd.org>; Thu, 18 Dec 2008 12:01:38 GMT
	(envelope-from kib@repoman.freebsd.org)
Received: (from svn2cvs@localhost)
	by repoman.freebsd.org (8.14.3/8.14.3/Submit) id mBIC1cMs030080
	for cvs-src-old@freebsd.org; Thu, 18 Dec 2008 12:01:38 GMT
	(envelope-from kib@repoman.freebsd.org)
Message-Id: <200812181201.mBIC1cMs030080@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to
	kib@repoman.freebsd.org using -f
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 18 Dec 2008 12:01:19 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/kern vfs_syscalls.c
X-BeenThere: cvs-src-old@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: **OBSOLETE** CVS commit messages for the src tree
	<cvs-src-old.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src-old>
List-Post: <mailto:cvs-src-old@freebsd.org>
List-Help: <mailto:cvs-src-old-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 18 Dec 2008 12:01:38 -0000

kib         2008-12-18 12:01:19 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_syscalls.c 
  Log:
  SVN rev 186277 on 2008-12-18 12:01:19Z by kib
  
  The quotactl, statfs and fstatfs syscall implementations may dereference
  NULL pointer to struct mount if the looked up vnode is reclaimed. Also,
  these syscalls only mnt_ref() the mp, still allowing it to be unmounted;
  only struct mount memory is kept from being reused.
  
  Lock the vnode when doing name lookup, then reference its mount point,
  unlock the vnode and vfs_busy the mountpoint. This sequence shall take
  care of both races.
  
  Reported and tested by: pho
  Discussed with: attilio
  MFC after:      1 month
  
  Revision  Changes    Path
  1.467     +18 -6     src/sys/kern/vfs_syscalls.c