dubbo远程方法调用检测场景下存在污点丢失问题

[Maskhe]

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Version

1.3.0

Installation Type

Other (specify below)

Service Name

DongTai-agent-java

Describe the details of the bug and the steps to reproduce it

dubbo的provider端代码如下，其中，参数word是用户可控的内容，但是此处没有被检出

原因：

因为上述示例污点经过了字符串拼接后才流入sink点，而字符串拼接是一个propagator节点，目前agent进入propagator的处理逻辑要求已经离开了souce节点（sourceLevel==0），但是agent在进入dubbo的monitor.invoke()方法时对souceLevel进行了+1操作，而在污点流到propagator之前没有执行souceLevel-1操作，导致后续的所有propagator节点都会被忽略，对应的污点也就丢失了

Additional Information

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