Sandbox::https://github.com/dotnet/SqlClient/pull/4982

github-actions · 2026-11-03T18:29:18Z

Description

Cherry-pick of #4941 (b714187042261aa00efc0e7c8f421af3dfd9b4c4) into release/7.0 for 7.0.4, with merge conflicts resolved.

Validate the metadata and authentication prerequisites needed to consume ROW, NBCROW, ALTROW, and SSPI tokens. Malformed responses use the existing corrupted-stream parsing error and invalidate the connection instead of dereferencing missing state or using unrelated result metadata. Valid result processing remains unchanged.

Release-branch adaptations:

Preserve the release branch's alternate-metadata collection formatting while removing the obsolete debug assertion.
Include the upstream ConnectionPoolVersionScope and SimulatedServerPoolScope test helpers required by the regression tests.
Retain 44 applicable simulated-server cases, including synchronous/asynchronous rejection, pool recovery, valid results, and packet-boundary handling. Omit the four pool V2 cases because this branch explicitly throws NotImplementedException when that implementation is selected.
Register the new compatibility test in the manual-test project's explicit test-set-2 compile list, and use direct connection construction consistent with this branch because its DataTestUtility has no CreateConnection factory.

No public API declarations, dependencies, localized resources, connection-string settings, or AppContext switches change. Protocol rationale and malformed-response compatibility details are documented in #4941; no public documentation changes are required.

Issues

Backport of #4941.

azure-pipelines · 2026-11-03T18:29:28Z

Azure Pipelines: There may be pipelines that require an authorized user to comment /azp run to run.

To resolve, run: git cherry-pick b714187

…4941) * Validate parser prerequisites before consuming TDS tokens Reject missing row metadata, unmatched alternate metadata, and unavailable SSPI providers through the existing corrupted-stream failure path. Guard reader transitions and add simulated-server and compatibility coverage. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Explain parser regression test scenarios and assertions Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * Refactor parser prerequisite tests to address PR #4941 feedback Separate reader/non-query, sync/async, and packet-boundary outcomes. Share setup, pool recovery, and reader cleanup helpers while preserving all 48 test cases. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> (cherry picked from commit b714187)

paulmedynski · 2026-11-06T10:48:55Z

/azp run

azure-pipelines · 2026-11-06T10:49:16Z

Azure Pipelines: Successfully started running 2 pipeline(s). 1 pipeline(s) were filtered out due to trigger conditions.

Copilot

🔵 Needs a closer look

Maintainer validation is needed because this backport affects connection teardown across login, async readers, and pooling, while real-server tests failed to connect and Windows/native-SNI and .NET Framework execution remain unverified.

No open issues 🎉

What changed in this PR

Backports #4941 to release/7.0 for 7.0.4, hardening SqlClient’s TDS parser against missing metadata or authentication state while preserving valid result processing.

Changes:

Validate ROW, NBCROW, ALTROW, and SSPI prerequisites; reject malformed responses with the existing corrupted-stream error and invalidate the connection.
Guard alternate-result transitions and remove the obsolete Debug-only metadata assertion.
Add 44 simulated-server regression cases, pool-isolation helpers, and four real-server compatibility cases adapted to the release branch.

Reported simulated-server tests passed across three target frameworks. Real-server runtime compatibility and Windows/.NET Framework validation remain unverified locally.

File	Description
src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/ParserPrerequisiteTests.cs	Tests malformed responses, pool recovery, valid results, and packet boundaries.
src/Microsoft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/Fixtures/SimulatedServerPoolScope.cs	Isolates and clears each simulated-server scenario’s pool.
src/Microsoft.Data.SqlClient/tests/ManualTests/SQL/ConnectivityTests/ParserResultProcessingTest.cs	Checks valid result processing and connection reuse with sync/async APIs.
src/Microsoft.Data.SqlClient/tests/ManualTests/Microsoft.Data.SqlClient.ManualTests.csproj	Includes the compatibility test in test set 2.
src/Microsoft.Data.SqlClient/tests/Common/ConnectionPoolVersionScope.cs	Scopes pool selection and clears pools before and after use.
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlDataReader.cs	Rejects missing or unmatched alternate-result metadata.
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Parser/Tokens/TdsAltMetadataCollection.cs	Removes the Debug-only failure for unmatched metadata identifiers.
src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/Parser/TdsParser.cs	Adds prerequisite checks and shared corrupted-stream rejection.

_{Review effort: Balanced}

codecov · 2026-11-06T12:09:59Z

Codecov Report

❌ Patch coverage is 77.77778% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.79%. Comparing base (0620c4c) to head (58887b4).
⚠️ Report is 4 commits behind head on release/7.0.

Files with missing lines	Patch %	Lines
...t/src/Microsoft/Data/SqlClient/Parser/TdsParser.cs	84.00%	4 Missing ⚠️
...ient/src/Microsoft/Data/SqlClient/SqlDataReader.cs	63.63%	4 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (0620c4c) and HEAD (58887b4). Click for more details.

HEAD has 1 upload less than BASE

Flag BASE (0620c4c) HEAD (58887b4)

CI-SqlClient 1 0

Additional details and impacted files

@@               Coverage Diff               @@
##           release/7.0    #4982      +/-   ##
===============================================
- Coverage        73.21%   66.79%   -6.42%     
===============================================
  Files              296      291       -5     
  Lines            43453    66420   +22967     
===============================================
+ Hits             31813    44368   +12555     
- Misses           11640    22052   +10412

Flag	Coverage Δ
CI-SqlClient	`?`
PR-SqlClient-Project	`66.79% <77.77%> (?)`

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github-actions Bot added this to the 7.0.4 milestone Nov 3, 2026

github-project-automation Bot added this to SqlClient Board Nov 3, 2026

github-project-automation Bot moved this to To triage in SqlClient Board Nov 3, 2026

paulmedynski changed the title ~~[7.0.4 Cherry-pick - CONFLICTS] Validate TDS parser prerequisites and invalidate malformed responses~~ [7.0.4 Cherry-pick] Validate TDS parser prerequisites and invalidate malformed responses Nov 6, 2026

github-actions Bot and others added 2 commits November 6, 2026 06:47

Cherry-pick of #4941 requires manual resolution

54998e6

To resolve, run: git cherry-pick b714187

paulmedynski force-pushed the dev/automation/pr-4941-to-7.0.4 branch from df7d816 to 58887b4 Compare November 6, 2026 10:47

paulmedynski requested a balanced review from Copilot November 6, 2026 10:48

paulmedynski changed the title ~~[7.0.4 Cherry-pick] Validate TDS parser prerequisites and invalidate malformed responses~~ [7.0.4] Validate TDS parser prerequisites and invalidate malformed responses (#4941) Nov 6, 2026

paulmedynski marked this pull request as ready for review November 6, 2026 10:48

paulmedynski requested a review from a team as a code owner November 6, 2026 10:48

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paulmedynski moved this from To triage to In review in SqlClient Board Nov 6, 2026

Copilot started reviewing on behalf of paulmedynski November 6, 2026 10:49

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paulmedynski added the Code Health 💊 Issues/PRs that are targeted to source code quality improvements. label Nov 6, 2026

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paulmedynski approved these changes Nov 6, 2026

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Comment thread src/Microsoft.Data.SqlClient/tests/Common/ConnectionPoolVersionScope.cs Resolved

Comment thread ...oft.Data.SqlClient/tests/UnitTests/SimulatedServerTests/Fixtures/SimulatedServerPoolScope.cs Resolved

paulmedynski enabled auto-merge (squash) November 6, 2026 10:54

cheenamalhotra approved these changes Nov 6, 2026

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paulmedynski merged commit 6c0cfdc into release/7.0 Nov 6, 2026
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paulmedynski deleted the dev/automation/pr-4941-to-7.0.4 branch November 6, 2026 16:19

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[7.0.4] Validate TDS parser prerequisites and invalidate malformed responses (#4941) - #4982

[7.0.4] Validate TDS parser prerequisites and invalidate malformed responses (#4941)#4982
paulmedynski merged 2 commits into
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