<AWT Dev> Review Request: JDK-8179014 JFileChooser with Windows look and feel crashes on win 10 + jre-8 131

Phil Race philip.race at oracle.com
Sat Apr 29 17:30:15 UTC 2017

I agree. This switch statement clearly was written in the expectation that each case executed return.

And as I said offline pls confirm that you are confident that all return paths actually handle that null which may not have been tested in practice before now. There seemed to be several code paths.


> On Apr 29, 2017, at 5:33 AM, Kevin Rushforth <kevin.rushforth at oracle.com> wrote:
> I'm not a "R"eviewer for AWT, but this part of the change looks wrong to me:
>          case STRRET_CSTR :
> +            if (pStrret->cStr != NULL) {
>              return JNU_NewStringPlatform(env, reinterpret_cast<const char*>(pStrret->cStr));
> +            }
>          case STRRET_OFFSET :
> Did you really intended that a NULL pStrret->cStr pointer should fall through to the next case (STRRET_OFFSET)? If so, then a comment is in order because this seems odd.
> -- Kevin
> Prem Balakrishnan wrote:
>> Hi,
>> Please review fix for JDK 9,
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8179014
>> Webrev: http://cr.openjdk.java.net/~pkbalakr/8179014/webrev.00/
>> Issue:
>> JFileChooser with Windows LAF crashes on Windows 10.
>> This issue is reproducible only on Windows 10 (v1703).
>> Creating GodMode directory is the only way we are able to reproduce this issue.
>> Cause:
>> IShellFolder::GetDisplayNameOf() method is used to retrieve the display name of folder/subfolder using the GUID.
>> This method  returns NULL for GodMode directory [i.e., folder created with name: GodMode.{ED7BA470-8E54-465E-825C-99712043E01C}].
>> In previous version of windows (tested on v1511) this call returns name “GodMode”.
>> Hence we get crash when processing the return data from the this method.
>> Why only on Windows LAF?
>> Unlike other LAFs in Windows LAF “useSystemExtensionHiding” is set to true.
>> This check avoids the call to IShellFolder::GetDisplayNameOf() method in all other LAF’s.
>> Hence crash is not reported on other LAFs.
>> Fix:
>> Added missing NULL checks in native method.
>> This results in native method returning NULL in this case, which has already been handled on java side, hence no additional change is needed.
>> Regards,
>> Prem
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