From a7f18116c2d3337d313eb0ea7ecbc62ec7870123 Mon Sep 17 00:00:00 2001
From: Robert Watson <rwatson@FreeBSD.org>
Date: Tue, 7 Feb 2006 23:44:31 +0000
Subject: [PATCH] Acquire vnode lock around call to VOP_GETATTR() in
 audit_record_write(). In the future, we may want to acquire the lock early in
 the function and hold it across calls to vn_rdwr(), etc, to avoid multiple
 acquires.

Spotted by:	kris (bugmagnet)
Obtained from:	TrustedBSD Project
---
 sys/security/audit/audit.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/security/audit/audit.c b/sys/security/audit/audit.c
index 3ddad11eb554..bc3a795b8758 100644
--- a/sys/security/audit/audit.c
+++ b/sys/security/audit/audit.c
@@ -282,7 +282,9 @@ audit_record_write(struct vnode *vp, struct kaudit_record *ar,
 	if (ret)
 		goto out;
 
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
 	ret = VOP_GETATTR(vp, &vattr, cred, td);
+	VOP_UNLOCK(vp, 0, td);
 	if (ret)
 		goto out;