br: fix potential overflow issues

[RidRisR]

What problem does this PR solve?

Issue Number: close #64222

Problem Summary:

Fix the potential overflow issues

What changed and how does it work?

Use Claude to scan all files under br dir, find all potential overflow issues and fix them (with human double check) one by one.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[tiprow]

Hi @RidRisR. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[codecov]

Codecov Report

❌ Patch coverage is 62.16216% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.9971%. Comparing base (d7470ff) to head (8d5397d).
⚠️ Report is 51 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #64219        +/-   ##
================================================
+ Coverage   72.7344%   74.9971%   +2.2626%     
================================================
  Files          1853       1882        +29     
  Lines        500569     521228     +20659     
================================================
+ Hits         364086     390906     +26820     
+ Misses       114348     106525      -7823     
- Partials      22135      23797      +1662     

Flag	Coverage Δ
integration	48.2837% <21.6216%> (?)
unit	72.5989% <62.1621%> (+0.3124%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	62.9646% <62.1621%> (+16.5531%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign leavrth for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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Needs approval from an approver in each of these files:

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• br/pkg/storage/OWNERS

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[RidRisR]

/retest

[tiprow]

@RidRisR: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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