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fix(engine/windows): keep tooltip position rect alive - fix use after free - #188476
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mattkae merged 5 commits intoJul 6, 2026
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging. If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing. If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group. |
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This pull request updates host_window_tooltip.cc to manage the lifetime of the WindowRect returned by get_position_callback_ using std::unique_ptr with a custom free deleter. Feedback indicates that if get_position_callback_ returns nullptr, dereferencing rect will cause a null pointer dereference, and suggests adding a null check to handle this case safely.
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Match the popup window positioning path by owning the callback result with a scoped deleter until after the constrained-size check has read it.
Since the function is named HostWindowPopup::UpdatePosition and we can't update the position without the position rect. I'm going to approve Gemini's suggested fix of returning early using a guard. Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
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Yup, that seems like a reasonable improvement. Thanks for the contribution!
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There was a conflict from a refactor / variable name change in adbaad4 that I resolved via webui |
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The Google tests timed out, I restarted them. |
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Is there anything else left to do? Can this be merged now? |
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Added to the queue! Should merge shortly :) |
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… free (flutter#188476) Pointer to Tooltip Position Rectangle was being free'd, then used after free. Now using a scoped deleter until after the constrained-size check has read it. ## Pre-launch Checklist - [X] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [X] I read the [AI contribution guidelines] and understand my responsibilities, or I am not using AI tools. - [X] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [X] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [X] I signed the [CLA]. - [X] I listed at least one issue that this PR fixes in the description above. - [X] I updated/added relevant documentation (doc comments with `///`). - [X] I added new tests to check the change I am making, or this PR is [test-exempt]. - [X] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [X] All existing and new tests are passing. If you need help, consider asking for advice on the #hackers-new channel on [Discord]. If this change needs to override an active code freeze, provide a comment explaining why. The code freeze workflow can be overridden by code reviewers. See pinned issues for any active code freezes with guidance. **Note**: The Flutter team is currently trialing the use of [Gemini Code Assist for GitHub](https://developers.google.com/gemini-code-assist/docs/review-github-code). Comments from the `gemini-code-assist` bot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- Links --> [Contributor Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview [AI contribution guidelines]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#ai-contribution-guidelines [Tree Hygiene]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md [test-exempt]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests [Flutter Style Guide]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md [Features we expect every widget to implement]: https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md [Data Driven Fixes]: https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md --------- Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> Co-authored-by: Loïc Sharma <737941+loic-sharma@users.noreply.github.com>
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…12137) Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions) Manual roll requested by stuartmorgan@google.com flutter/flutter@6995038...91939cc 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067) 2026-07-07 katelovett@google.com Bump customer testing version for new registrants (flutter/flutter#189070) 2026-07-07 engine-flutter-autoroll@skia.org Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069) 2026-07-07 47866232+chunhtai@users.noreply.github.com fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043) 2026-07-07 katelovett@google.com Bump goldctl (flutter/flutter#189030) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060) 2026-07-07 magder@google.com Collect analytics on AI agent usage (flutter/flutter#187630) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054) 2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052) 2026-07-07 vuhoangminh97@gmail.com Fix RenderSliverPadding setter assertion (flutter/flutter#187353) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037) 2026-07-07 49402500+fahaddoc@users.noreply.github.com Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035) 2026-07-07 116356835+AbdeMohlbi@users.noreply.github.com Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163) 2026-07-07 31859944+LongCatIsLooong@users.noreply.github.com Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835) 2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031) 2026-07-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032) 2026-07-06 31859944+LongCatIsLooong@users.noreply.github.com Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894) 2026-07-06 154381524+flutteractionsbot@users.noreply.github.com Sync CHANGELOG.md from stable (flutter/flutter#189025) 2026-07-06 matt.kosarek@canonical.com Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017) 2026-07-06 6655696+guidezpl@users.noreply.github.com Skip locked issues in no-response check (flutter/flutter#188950) 2026-07-06 47866232+chunhtai@users.noreply.github.com Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830) 2026-07-06 codefu@google.com ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021) 2026-07-06 jesswon@google.com [AGP 9] Update Flutter Template Versions (flutter/flutter#188762) 2026-07-06 126701490+richyo-codes@users.noreply.github.com fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476) 2026-07-06 bkonyi@google.com [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454) 2026-07-06 bkonyi@google.com [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452) 2026-07-06 bkonyi@google.com [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921) 2026-07-06 engine-flutter-autoroll@skia.org Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015) 2026-07-06 bkonyi@google.com [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745) 2026-07-06 bkonyi@google.com [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922) 2026-07-06 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#189009) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006) 2026-07-06 engine-flutter-autoroll@skia.org Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004) 2026-07-06 Rusino@users.noreply.github.com Fixing multiline GetBoxesForRange (flutter/flutter#188803) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990) 2026-07-06 737941+loic-sharma@users.noreply.github.com Add debugPaintFocusBoxes (flutter/flutter#188288) 2026-07-05 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989) 2026-07-05 engine-flutter-autoroll@skia.org Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988) ...
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…lutter#12137) Manual roll Flutter from 6995038d96ef to 91939cc4db78 (48 revisions) Manual roll requested by stuartmorgan@google.com flutter/flutter@6995038...91939cc 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 80ae1deed9ed to 075fbe4778d9 (6 revisions) (flutter/flutter#189067) 2026-07-07 katelovett@google.com Bump customer testing version for new registrants (flutter/flutter#189070) 2026-07-07 engine-flutter-autoroll@skia.org Roll Packages from fc00ceb to 92525f5 (2 revisions) (flutter/flutter#189069) 2026-07-07 47866232+chunhtai@users.noreply.github.com fix android semantics integration test hangs due to postframe callback (flutter/flutter#189043) 2026-07-07 katelovett@google.com Bump goldctl (flutter/flutter#189030) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 71db7c06c5fe to 80ae1deed9ed (2 revisions) (flutter/flutter#189060) 2026-07-07 magder@google.com Collect analytics on AI agent usage (flutter/flutter#187630) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 125a76cc4cf3 to 71db7c06c5fe (4 revisions) (flutter/flutter#189054) 2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 70577d6f2bba to c648e3429d76 (1 revision) (flutter/flutter#189052) 2026-07-07 vuhoangminh97@gmail.com Fix RenderSliverPadding setter assertion (flutter/flutter#187353) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 2dde156aec3e to 125a76cc4cf3 (3 revisions) (flutter/flutter#189037) 2026-07-07 49402500+fahaddoc@users.noreply.github.com Explain asynchronous causes in the setState() called after dispose() error (flutter/flutter#187294) 2026-07-07 engine-flutter-autoroll@skia.org Roll Skia from 7dccd1e79a5b to 2dde156aec3e (2 revisions) (flutter/flutter#189035) 2026-07-07 116356835+AbdeMohlbi@users.noreply.github.com Add `STRING_CATALOG_GENERATE_SYMBOLS = YES;` (flutter/flutter#188163) 2026-07-07 31859944+LongCatIsLooong@users.noreply.github.com Print warnings on Intel Macs / targeting Intel Macs (flutter/flutter#188835) 2026-07-07 engine-flutter-autoroll@skia.org Roll Dart SDK from 4c03f64b19f6 to 70577d6f2bba (1 revision) (flutter/flutter#189031) 2026-07-07 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from n1Lm2Z4DZkfC3bwj5... to 7RjQJBW3m-3Jl-7jr... (flutter/flutter#189032) 2026-07-06 31859944+LongCatIsLooong@users.noreply.github.com Recommend `OverlayPortal.overlayChildLayoutBuilder` over Target-Follower (flutter/flutter#188894) 2026-07-06 154381524+flutteractionsbot@users.noreply.github.com Sync CHANGELOG.md from stable (flutter/flutter#189025) 2026-07-06 matt.kosarek@canonical.com Rename preferredSize to size and preferredConstraints to constraints in the windowing API (flutter/flutter#189017) 2026-07-06 6655696+guidezpl@users.noreply.github.com Skip locked issues in no-response check (flutter/flutter#188950) 2026-07-06 47866232+chunhtai@users.noreply.github.com Fix potential race condtion in android_semantics_integration_test (flutter/flutter#188830) 2026-07-06 codefu@google.com ci: udpate wait-for-engine-build composite action to cocoon (flutter/flutter#189020) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2b55eed5500d to 7dccd1e79a5b (3 revisions) (flutter/flutter#189021) 2026-07-06 jesswon@google.com [AGP 9] Update Flutter Template Versions (flutter/flutter#188762) 2026-07-06 126701490+richyo-codes@users.noreply.github.com fix(engine/windows): keep tooltip position rect alive - fix use after free (flutter/flutter#188476) 2026-07-06 bkonyi@google.com [Tool] Fix null check operator crash in currentPackageConfig (flutter/flutter#188454) 2026-07-06 bkonyi@google.com [Tool] Gracefully handle WDAC/AppLocker blocks for impellerc (flutter/flutter#188452) 2026-07-06 bkonyi@google.com [flutter_tools] Throw DaemonException if app fails to start early (flutter/flutter#188921) 2026-07-06 engine-flutter-autoroll@skia.org Roll Dart SDK from ce7a2567eb59 to 4c03f64b19f6 (2 revisions) (flutter/flutter#189015) 2026-07-06 bkonyi@google.com [flutter_tools, engine] Add --disable-service-origin-check option to disable VM service origin checks (flutter/flutter#188745) 2026-07-06 bkonyi@google.com [flutter_tools] Fix test flakiness in widget_preview_detection_test.dart (flutter/flutter#188922) 2026-07-06 137456488+flutter-pub-roller-bot@users.noreply.github.com Roll pub packages (flutter/flutter#189009) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from c0e2b9667d91 to 2b55eed5500d (1 revision) (flutter/flutter#189006) 2026-07-06 engine-flutter-autoroll@skia.org Roll Packages from 2fbe873 to fc00ceb (1 revision) (flutter/flutter#189007) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from b68567542f81 to c0e2b9667d91 (1 revision) (flutter/flutter#189004) 2026-07-06 Rusino@users.noreply.github.com Fixing multiline GetBoxesForRange (flutter/flutter#188803) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from e15ea7a4b927 to b68567542f81 (4 revisions) (flutter/flutter#189000) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 79806692425f to e15ea7a4b927 (2 revisions) (flutter/flutter#188992) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 2826ae6dc649 to 79806692425f (1 revision) (flutter/flutter#188991) 2026-07-06 engine-flutter-autoroll@skia.org Roll Skia from 7f99eee20fd6 to 2826ae6dc649 (1 revision) (flutter/flutter#188990) 2026-07-06 737941+loic-sharma@users.noreply.github.com Add debugPaintFocusBoxes (flutter/flutter#188288) 2026-07-05 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from bkK6BLiZDRnE7AQQj... to n1Lm2Z4DZkfC3bwj5... (flutter/flutter#188989) 2026-07-05 engine-flutter-autoroll@skia.org Roll Skia from 75a4bf6706bd to 7f99eee20fd6 (2 revisions) (flutter/flutter#188988) ...
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My bad, I missed this. This causes crash on windows (definitely in debug build) - the memory is allocated with |
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Actually, it seems that we had this before this PR. I need to check other call sites as well. This looks like a good explanation for the heap corruption issue I've been seeing. |
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Pointer to Tooltip Position Rectangle was being free'd, then used after free.
Now using a scoped deleter until after the constrained-size check has read it.
Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
If this change needs to override an active code freeze, provide a comment explaining why. The code freeze workflow can be overridden by code reviewers. See pinned issues for any active code freezes with guidance.
Note: The Flutter team is currently trialing the use of Gemini Code Assist for GitHub. Comments from the
gemini-code-assistbot should not be taken as authoritative feedback from the Flutter team. If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed.