[PATCH 4.9 30/39] smb3: on reconnect set PreviousSessionId field

[Greg Kroah-Hartman]

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

------------------

From: Steve French <stfre...@microsoft.com>

commit b2adf22fdfba85a6701c481faccdbbb3a418ccfc upstream.

The server detects reconnect by the (non-zero) value in PreviousSessionId
of SMB2/SMB3 SessionSetup request, but this behavior regressed due
to commit 166cea4dc3a4f66f020cfb9286225ecd228ab61d
("SMB2: Separate RawNTLMSSP authentication from SMB2_sess_setup")

CC: Stable <sta...@vger.kernel.org>
CC: Sachin Prabhu <spra...@redhat.com>
Signed-off-by: Steve French <smfre...@gmail.com>
Reviewed-by: Ronnie Sahlberg <lsahl...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/cifs/smb2pdu.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1004,6 +1004,7 @@ SMB2_sess_setup(const unsigned int xid,
        sess_data->ses = ses;
        sess_data->buf0_type = CIFS_NO_BUFFER;
        sess_data->nls_cp = (struct nls_table *) nls_cp;
+       sess_data->previous_session = ses->Suid;
 
        while (sess_data->func)
                sess_data->func(sess_data);