linux-kernel - [PATCH 3.12 021/181] Do not send ClientGUID on SMB2.02 dialect

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Date:	Mon, 30 Jun 2014 13:50:42 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Steve French <smfrench@...il.com>,
	Sachin Prabhu <sprabhu@...hat.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 021/181] Do not send ClientGUID on SMB2.02 dialect

From: Steve French <smfrench@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 3c5f9be108783c05cade918d29c8711b236acb1d upstream.

ClientGUID must be zero for SMB2.02 dialect.  See section 2.2.3
of MS-SMB2. For SMB2.1 and later it must be non-zero.

Signed-off-by: Steve French <smfrench@...il.com>
CC: Sachin Prabhu <sprabhu@...hat.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/cifs/smb2pdu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 37de258d9a34..5818d2ca66f1 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -375,7 +375,12 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 
 	req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 
-	memcpy(req->ClientGUID, server->client_guid, SMB2_CLIENT_GUID_SIZE);
+	/* ClientGUID must be zero for SMB2.02 dialect */
+	if (ses->server->vals->protocol_id == SMB20_PROT_ID)
+		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
+	else
+		memcpy(req->ClientGUID, server->client_guid,
+			SMB2_CLIENT_GUID_SIZE);
 
 	iov[0].iov_base = (char *)req;
 	/* 4 for rfc1002 length field */
-- 
2.0.0

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