From 2655f626323b1618ce6b8ce04e654a62ffeb912a Mon Sep 17 00:00:00 2001
From: David Greenman <dg@FreeBSD.org>
Date: Mon, 13 Feb 1995 13:45:04 +0000
Subject: [PATCH] In sync(), don't dereference the proc pointer if it's NULL.
 Should fix most or all of the problems with calling sync() without a curproc
 (which can happen in machdep.c during a panic sync).

---
 sys/kern/vfs_extattr.c  | 4 ++--
 sys/kern/vfs_syscalls.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/sys/kern/vfs_extattr.c b/sys/kern/vfs_extattr.c
index e5c52188c854..b63f7482795a 100644
--- a/sys/kern/vfs_extattr.c
+++ b/sys/kern/vfs_extattr.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vfs_syscalls.c	8.13 (Berkeley) 4/15/94
- * $Id: vfs_syscalls.c,v 1.15 1994/10/21 01:19:15 wollman Exp $
+ * $Id: vfs_syscalls.c,v 1.16 1994/11/04 14:41:34 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -331,7 +331,7 @@ sync(p, uap, retval)
 		    !vfs_busy(mp)) {
 			asyncflag = mp->mnt_flag & MNT_ASYNC;
 			mp->mnt_flag &= ~MNT_ASYNC;
-			VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
+			VFS_SYNC(mp, MNT_NOWAIT, p != NULL ? p->p_ucred : NOCRED, p);
 			if (asyncflag)
 				mp->mnt_flag |= MNT_ASYNC;
 			vfs_unbusy(mp);
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index e5c52188c854..b63f7482795a 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)vfs_syscalls.c	8.13 (Berkeley) 4/15/94
- * $Id: vfs_syscalls.c,v 1.15 1994/10/21 01:19:15 wollman Exp $
+ * $Id: vfs_syscalls.c,v 1.16 1994/11/04 14:41:34 davidg Exp $
  */
 
 #include <sys/param.h>
@@ -331,7 +331,7 @@ sync(p, uap, retval)
 		    !vfs_busy(mp)) {
 			asyncflag = mp->mnt_flag & MNT_ASYNC;
 			mp->mnt_flag &= ~MNT_ASYNC;
-			VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
+			VFS_SYNC(mp, MNT_NOWAIT, p != NULL ? p->p_ucred : NOCRED, p);
 			if (asyncflag)
 				mp->mnt_flag |= MNT_ASYNC;
 			vfs_unbusy(mp);