[HARMONY-6303] [JDWP] Fix a potential crash problem that would happen if String object is GCed

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 5.0M10
• Component/s: JDK
• Patch Info: Patch Available
• Assignee: Unassigned
• Reporter: Jim Yu
• Created: 13/Aug/09 07:33
• Updated: 19/Aug/09 07:18

Description

I found there was a potential crash problem in StringReference command set, Value command. In the statement [1] as following shows, if the string object for which we are trying to read its ID has been GCed actually, the string ID we retrieved would be null as a result. Hence if we pass the null value to the follwing jni invocations [2], crash would happen. The solution is that we should return the error code to the upper level when the string object is GCed in this case.

[1] jstring stringObject = m_cmdParser->command.ReadStringID(jni);

[2] jsize len = jni->GetStringLength(stringObject);
jsize utfLen = jni->GetStringUTFLength(stringObject);