NFSv4.1: fix SECINFO* use of put_rpccred

Recent SP4_MACH_CRED changes allows rpc_message.rpc_cred to change,
so keep a separate pointer to the machine cred for put_rpccred.
Signed-off-by: Weston Andros Adamson <dros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4proc.c

@@ -6003,10 +6003,12 @@ static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct
 		.rpc_resp = &res,
 	};
 	struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
+	struct rpc_cred *cred = NULL;
 
 	if (use_integrity) {
 		clnt = NFS_SERVER(dir)->nfs_client->cl_rpcclient;
-		msg.rpc_cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
+		cred = nfs4_get_clid_cred(NFS_SERVER(dir)->nfs_client);
+		msg.rpc_cred = cred;
 	}
 
 	dprintk("NFS call  secinfo %s\n", name->name);
@@ -6018,8 +6020,8 @@ static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct
 				&res.seq_res, 0);
 	dprintk("NFS reply  secinfo: %d\n", status);
 
-	if (msg.rpc_cred)
-		put_rpccred(msg.rpc_cred);
+	if (cred)
+		put_rpccred(cred);
 
 	return status;
 }
@@ -7500,11 +7502,13 @@ _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
 		.rpc_resp = &res,
 	};
 	struct rpc_clnt *clnt = server->client;
+	struct rpc_cred *cred = NULL;
 	int status;
 
 	if (use_integrity) {
 		clnt = server->nfs_client->cl_rpcclient;
-		msg.rpc_cred = nfs4_get_clid_cred(server->nfs_client);
+		cred = nfs4_get_clid_cred(server->nfs_client);
+		msg.rpc_cred = cred;
 	}
 
 	dprintk("--> %s\n", __func__);
@@ -7512,8 +7516,8 @@ _nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
 				&res.seq_res, 0);
 	dprintk("<-- %s status=%d\n", __func__, status);
 
-	if (msg.rpc_cred)
-		put_rpccred(msg.rpc_cred);
+	if (cred)
+		put_rpccred(cred);
 
 	return status;
 }