comment.php

<?php

$comment = get_comment( 12345 );
$post_id = $comment->comment_post_ID();
$post = get_post( $post_id ); // Let's say post_title = Foo

do_action( 'comment_goodies', $comment, $post );

var_dump( $post );

some-plugin.php

<?php

add_action( 'comment_goodies', function( $comment, $post ) {
    wp_update_post( array(
        'ID' => $post->ID,
        'post_title' => 'Bar',
    ) );
}, 10, 2 );