From 099bd05f27ff24a3041d54e7ed42d2eb681484b9 Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Fri, 14 Mar 2008 14:25:32 -0400
Subject: [PATCH] lockd: Ensure NSM strings aren't longer than protocol allows

Introduce a special helper function to check the length of NSM strings
before they are placed on the wire.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
 fs/lockd/mon.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 908b23fadd05..84fd84cb67b7 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -149,6 +149,15 @@ nsm_create(void)
  * XDR functions for NSM.
  */
 
+static __be32 *xdr_encode_nsm_string(__be32 *p, char *string)
+{
+	size_t len = strlen(string);
+
+	if (len > SM_MAXSTRLEN)
+		len = SM_MAXSTRLEN;
+	return xdr_encode_opaque(p, string, len);
+}
+
 static __be32 *
 xdr_encode_common(struct rpc_rqst *rqstp, __be32 *p, struct nsm_args *argp)
 {