logger_get_mask_for_buffer (struct t_gui_buffer *buffer)
{
    char *name, *option_name, *ptr_end;
    struct t_config_option *ptr_option;

    name = logger_build_option_name (buffer);
    if (!name)
        return NULL;

    option_name = strdup (name);
    if (option_name)
    {
        ptr_end = option_name + strlen (option_name);
        while (ptr_end >= option_name)
        {
            ptr_option = logger_config_get_mask (option_name);
            if (ptr_option)
            {
                free (option_name);
                free (name);
                return weechat_config_string (ptr_option);
            }
            ptr_end--;
            while ((ptr_end >= option_name) && (ptr_end[0] != '.'))
            {
                ptr_end--;
            }
            if ((ptr_end >= option_name) && (ptr_end[0] == '.'))
                ptr_end[0] = '\0';
        }
        ptr_option = logger_config_get_mask (option_name);

        free (option_name);
        free (name);

        if (ptr_option)
            return weechat_config_string (ptr_option);
    }
    else
        free (name);

    /* nothing found => return default mask (if set) */
    if (weechat_config_string (logger_config_file_mask)
        && weechat_config_string (logger_config_file_mask)[0])
        return weechat_config_string (logger_config_file_mask);

    /* no default mask set */
    return NULL;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.