From 7b0b6888cc714d33846c6edef824e42bd0365b7d Mon Sep 17 00:00:00 2001
From: jeff <jeff@FreeBSD.org>
Date: Sun, 13 Mar 2005 11:47:04 +0000
Subject: [PATCH]  - A lock is required before calling VOP_REVOKE.  Our
 reference protects us    from accessing another vnode so a naked VOP_LOCK is
 sufficient.

Sponsored by:	Isilon Systems, Inc.
---
 sys/kern/kern_exit.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index a52e69521eca..e27e9b0cf750 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -320,8 +320,9 @@ retry:
 					sp->s_ttyvp = NULL;
 					SESS_UNLOCK(p->p_session);
 					sx_xunlock(&proctree_lock);
+					VOP_LOCK(ttyvp, LK_EXCLUSIVE, td);
 					VOP_REVOKE(ttyvp, REVOKEALL);
-					vrele(ttyvp);
+					vput(ttyvp);
 					sx_xlock(&proctree_lock);
 				}
 			}