Recebendo props via redux e alterando o state do componente

Login.js

// imports

class Login extends Component {
  state = {
    email: '',
    password: '',
    errors: {}
  }

  componentDidMount() {
    if (this.props.auth.isAuthenticated) {
      this.props.history.push('/dashboard')
    }
  }

  componentWillReceiveProps(nextProps) {
    if (nextProps.auth.isAuthenticated) {
      this.props.history.push('/dashboard')
    }
    if (nextProps.errors) {
      this.setState({ errors: nextProps.errors })
    }
  }
  
  // ...
}

// ...