MIN_PREAUTH_CTXT_DATA_LEN
if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
sizeof(struct smb2_neg_context) + MIN_PREAUTH_CTXT_DATA_LEN)