Check sqlite3_malloc64 result in Deserialize

[mattn]

Deserialize did not check the result of sqlite3_malloc64, so an allocation failure caused a write through a NULL pointer and crashed the process instead of returning an error.

Summary by CodeRabbit

• Bug Fixes
  • Improved handling of low-memory conditions during database deserialization.
  • Returns a clear out-of-memory error instead of proceeding with an invalid buffer.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c7e52220-7ddf-4923-8f5a-ed834b720a0d

📥 Commits

Reviewing files that changed from the base of the PR and between b7c167e and 7d6ccee.

📒 Files selected for processing (1)

• sqlite3_opt_serialize.go

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📝 Walkthrough

Walkthrough

SQLiteConn.Deserialize now checks temporary buffer allocation and returns an out-of-memory error when allocation fails for non-empty input.

Changes

Deserialize safety

Layer / File(s)	Summary
Temporary buffer allocation check sqlite3_opt_serialize.go	Deserialize detects a nil allocation from sqlite3_malloc64 when input is non-empty and returns "deserialize failed: out of memory".

Estimated code review effort: 1 (Trivial) | ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding a nil-result check for sqlite3_malloc64 in Deserialize.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-deserialize-nil-check

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