4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Steve French <stfrench@xxxxxxxxxxxxx> 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 <stable@xxxxxxxxxxxxxxx> CC: Sachin Prabhu <sprabhu@xxxxxxxxxx> Signed-off-by: Steve French <smfrench@xxxxxxxxx> Reviewed-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/cifs/smb2pdu.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1276,6 +1276,7 @@ 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; #ifdef CONFIG_CIFS_SMB311 /*