8315135: Memory leak in the native implementation of Pack200.Unpacker.unpack()

[simonis]

Hi all,

This pull request contains a backport of commit b77c161e from the openjdk/jdk11u-dev repository.

The commit being backported was authored by Volker Simonis on 30 Aug 2023 and was reviewed by Christoph Langer and Thomas Stuefe.

The backport applies cleanly except for the usual 11/8 directory shuffling and the following cosmetic context change in jni.cpp:

> --- a/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp
> +++ b/jdk/src/share/native/com/sun/java/util/jar/pack/jni.cpp
58c58
<    CHECK_EXCEPTION_RETURN_VALUE(uPtr, 0);
---
>    CHECK_EXCEPTION_RETURN_VALUE(uPtr, NULL);

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8315135: Memory leak in the native implementation of Pack200.Unpacker.unpack() (Bug - P3)

Reviewers

• Andrew John Hughes (@gnu-andrew - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk8u-dev.git pull/361/head:pull/361
$ git checkout pull/361

Update a local copy of the PR:
$ git checkout pull/361
$ git pull https://git.openjdk.org/jdk8u-dev.git pull/361/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 361

View PR using the GUI difftool:
$ git pr show -t 361

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Download this PR as a diff file:
https://git.openjdk.org/jdk8u-dev/pull/361.diff

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[bridgekeeper]

👋 Welcome back simonis! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (b37f1c71)

[simonis]

/clean

[openjdk]

@simonis This backport pull request is now marked as clean

[openjdk]

@simonis This change now passes all automated pre-integration checks.

After integration, the commit message for the final commit will be:

8315135: Memory leak in the native implementation of Pack200.Unpacker.unpack()

Reviewed-by: andrew

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 2 new commits pushed to the master branch:

• 33db95b: 8315280: Bump update version of OpenJDK: 8u402
• bbc068f: 8206179: com/sun/management/OperatingSystemMXBean/GetCommittedVirtualMemorySize.java fails with Committed virtual memory size illegal value

Please see this link for an up-to-date comparison between the source branch of this pull request and the master branch.
As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[gnu-andrew]

Backport looks ok (though not clean due to the context difference)

[simonis]

Thanks @gnu-andrew! Regarding the "clean" label, I was a little confused by the following line in the OpenJDK Backports Wiki:

A backport commit is considered clean if the changes in the original commit are identical to the changes in the backport commit. Note that only the changes have to be identical, not the changed lines.

And I actually still don't fully understand what exactly "Note that only the changes have to be identical, not the changed lines" means?

[simonis]

/integrate

[openjdk]

Going to push as commit 6632d0a.
Since your change was applied there have been 2 commits pushed to the master branch:

• 33db95b: 8315280: Bump update version of OpenJDK: 8u402
• bbc068f: 8206179: com/sun/management/OperatingSystemMXBean/GetCommittedVirtualMemorySize.java fails with Committed virtual memory size illegal value

Your commit was automatically rebased without conflicts.

[openjdk]

@simonis Pushed as commit 6632d0a.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

[gnu-andrew]

Thanks @gnu-andrew! Regarding the "clean" label, I was a little confused by the following line in the OpenJDK Backports Wiki:

A backport commit is considered clean if the changes in the original commit are identical to the changes in the backport commit. Note that only the changes have to be identical, not the changed lines.

And I actually still don't fully understand what exactly "Note that only the changes have to be identical, not the changed lines" means?

It's the first time I've seen that myself and I agree it's confusing. I think the intention may be to imply that it's clean if you make the same code changes even if they are in a different place in the file or even a different file. To me, that would be going a bit far.

The approach I've always used, even before we used GitHub and Skara, is that a backport is clean if it can be automated by tools i.e. if you apply the shuffle script, and then run patch, and it applies, it is clean. If you have to open a file and apply any hunks manually, that is not clean.

Even the former can be problematic if patch fuzzes the change into the wrong place, so I would be cautious even in those cases. That's why I actually quite like that 8u doesn't automatically add clean and patches do get a once over from a real human :) As someone has to approve anyway, I don't think it's really much extra work.