Index: vfs_syscalls.c
===================================================================
RCS file: /private/FreeBSD/src/sys/kern/vfs_syscalls.c,v
retrieving revision 1.343
diff -u -p -r1.343 vfs_syscalls.c
--- vfs_syscalls.c	6 Apr 2004 10:05:02 -0000	1.343
+++ vfs_syscalls.c	21 Apr 2004 08:58:49 -0000
@@ -197,6 +197,8 @@ quotactl(td, uap)
 	vrele(nd.ni_vp);
 	if (error)
 		return (error);
+	if (mp == NULL)
+		return (EOPNOTSUPP);
 	error = VFS_QUOTACTL(mp, uap->cmd, uap->uid, uap->arg, td);
 	vn_finished_write(mp);
 	return (error);