8351110: ImageIO.write for JPEG can write corrupt JPEG for certain thumbnail dimensions

[rm-gh-8]

Backporting JDK-8351110: ImageIO.write for JPEG can write corrupt JPEG for certain thumbnail dimensions. JPEG segments have a 65535-byte limit, but the code was writing larger segments, causing parsing errors when reading files back.

Two fixes implemented:

1. Constrains thumbnail dimensions to fit within the segment limit.

2. Added safety check to write2bytes that throws IIOException if segment size is exceeded.

Ran GHA Sanity Checks (passed) and related test (passed).

---

Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• JDK-8351110 needs maintainer approval

Issue

• JDK-8351110: ImageIO.write for JPEG can write corrupt JPEG for certain thumbnail dimensions (Bug - P4 - Requested)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/2471/head:pull/2471
$ git checkout pull/2471

Update a local copy of the PR:
$ git checkout pull/2471
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/2471/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 2471

View PR using the GUI difftool:
$ git pr show -t 2471

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/2471.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[openjdk]

⚠️ @rm-gh-8 This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (12492032)

[rm-gh-8]

/approval request for backport of JDK-8351110: ImageIO.write for JPEG can write corrupt JPEG for certain thumbnail dimensions.

Ran the updated and related tests on linux-x64, linux-aarch64, macos-aarch64 and windows-x64:

(All Passed) - make test TEST=test/jdk/javax/imageio/plugins/jpeg

Results are attached.
linux-aarch64-specific-test.log
linux-x64-specific-test.log
macos-aarch64-specific-test.log
windows-x64-specific-test.log

[openjdk]

@rm-gh-8
8351110: The approval request has been created successfully.