linux-kernel - [PATCH 3.12 49/72] Set previous session id correctly on SMB3 reconnect

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Date:   Mon,  7 Nov 2016 14:04:56 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Steve French <smfrench@...il.com>,
        Steve French <steve.french@...marydata.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 49/72] Set previous session id correctly on SMB3 reconnect

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

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

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

commit c2afb8147e69819885493edf3a7c1ce03aaf2d4e upstream.

Signed-off-by: Steve French <steve.french@...marydata.com>
Reported-by: David Goebel <davidgoe@...rosoft.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/cifs/smb2pdu.c | 5 +++++
 fs/cifs/smb2pdu.h | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index ac76b1dab3b8..1a6dde4bce62 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -566,6 +566,7 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 	char *security_blob;
 	char *ntlmssp_blob = NULL;
 	bool use_spnego = false; /* else use raw ntlmssp */
+	u64 previous_session = ses->Suid;
 
 	cifs_dbg(FYI, "Session Setup\n");
 
@@ -602,6 +603,10 @@ ssetup_ntlmssp_authenticate:
 		return rc;
 
 	req->hdr.SessionId = 0; /* First session, not a reauthenticate */
+
+	/* if reconnect, we need to send previous sess id, otherwise it is 0 */
+	req->PreviousSessionId = previous_session;
+
 	req->VcNumber = 0; /* MBZ */
 	/* to enable echos and oplocks */
 	req->hdr.CreditRequest = cpu_to_le16(3);
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 6133a4e45c6e..efcc77b51556 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -228,7 +228,7 @@ struct smb2_sess_setup_req {
 	__le32 Channel;
 	__le16 SecurityBufferOffset;
 	__le16 SecurityBufferLength;
-	__le64 PreviousSessionId;
+	__u64 PreviousSessionId;
 	__u8   Buffer[1];	/* variable length GSS security buffer */
 } __packed;
 
-- 
2.10.2