8303475: potential null pointer dereference in filemap.cpp

[GoeLin]

I backport this for parity with 17.0.18-oracle.

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Progress

• Change must not contain extraneous whitespace
• JDK-8303475 needs maintainer approval
• Commit message must refer to an issue

Warning

 ⚠️ Found leading lowercase letter in issue title for 8303475: potential null pointer dereference in filemap.cpp

Issue

• JDK-8303475: potential null pointer dereference in filemap.cpp (Bug - P3 - Approved)

Reviewing

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$ git checkout pull/4199

Update a local copy of the PR:
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$ git pull https://git.openjdk.org/jdk17u-dev.git pull/4199/head

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[bridgekeeper]

👋 Welcome back goetz! 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]

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

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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

8303475: potential null pointer dereference in filemap.cpp

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[openjdk]

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

[openjdk]

⚠️ @GoeLin 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]

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