[SMB3][PATCH] On reconnect set PreviousSessionId field in SessionSetup

[Steve French <smfrench@xxxxxxxxx>]

    smb3: on reconnect set PreviousSessionId field

    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 <stable@xxxxxxxxxxxxxxx>
    CC: Sachin Prabhu <sprabhu@xxxxxxxxxx>
    Signed-off-by: Steve French <smfrench@xxxxxxxxx>

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index c92b4e6689bd..71e7a5a05f12 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1352,6 +1352,7 @@ SMB2_sess_setup(const unsigned int xid, struct
cifs_ses *ses,
        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;

 #ifdef CONFIG_CIFS_SMB311
        /*


-- 
Thanks,

Steve

From bac1fdb1383256699c19edaa6ec1d6a389b2f638 Mon Sep 17 00:00:00 2001
From: Steve French <stfrench@xxxxxxxxxxxxx>
Date: Thu, 31 May 2018 15:19:25 -0500
Subject: [PATCH] smb3: on reconnect set PreviousSessionId field

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 <stable@xxxxxxxxxxxxxxx>
CC: Sachin Prabhu <sprabhu@xxxxxxxxxx>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
---
 fs/cifs/smb2pdu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index c92b4e6689bd..71e7a5a05f12 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -1352,6 +1352,7 @@ SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 	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;
 
 #ifdef CONFIG_CIFS_SMB311
 	/*
-- 
2.17.0