An integer overflow vulnerability exists within the handlers for the QueryXBitmaps and QueryXExtents protocol requests. Both requests result in a call to the build_range function.
QueryXBitmaps和QueryXExtents的协议请求处理程序中还存在一个整数溢出漏洞，这两个请求导致调用build_range函数。
Method handles act as both function Pointers and as function combinators, allowing a built-in way to construct a call protocol flow from a caller to a callee.
方法句柄可以同时作为函数的pointer和combinator，允许用内置的方式建立一个从调用器到被调用者的调用协议。
A protocol-specific call, pr_usrreq, is then made, which switches to the corresponding protocol-specific request associated with the socket descriptor. The prototype of the pr_usrreq function is.
然后进行协议特定的调用pr_usrreq，进而切换到与套接字描述符关联的相应协议特定的请求。
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