[jira] Commented: (HARMONY-6303) [JDWP] Fix a potential crash problem that would happen if String object is GCed

["Jim Yu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-6303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742755#action_12742755 ] 

Jim Yu commented on HARMONY-6303:
---------------------------------

Can anybody apply the patch if there is no problem? Thanks!

> [JDWP] Fix a potential crash problem that would happen if String object is GCed
> -------------------------------------------------------------------------------
>
>                 Key: HARMONY-6303
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6303
>             Project: Harmony
>          Issue Type: Bug
>          Components: JDK
>    Affects Versions: 5.0M10
>            Reporter: Jim Yu
>             Fix For: 5.0M11
>
>         Attachments: HARMONY-6303.diff
>
>
> 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);

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