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

[ronnie sahlberg]

Reviewed-by: Ronnie Sahlberg <lsahlber at redhat.com>

On Fri, Jun 1, 2018 at 6:32 AM, Steve French via samba-technical
<samba-technical at lists.samba.org> wrote:
>     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 at vger.kernel.org>
>     CC: Sachin Prabhu <sprabhu at redhat.com>
>     Signed-off-by: Steve French <smfrench at gmail.com>
>
> 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