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Fix dereference of nullptr in the moved-to-rect signal in the Linux embedder#189152

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robert-ancell merged 1 commit into
flutter:masterfrom
canonical:moved-to-rect-null-check
Jul 9, 2026
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Fix dereference of nullptr in the moved-to-rect signal in the Linux embedder#189152
robert-ancell merged 1 commit into
flutter:masterfrom
canonical:moved-to-rect-null-check

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@mattkae

@mattkae mattkae commented Jul 8, 2026

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What's new?

  • Per the docs, final_rect can be nullptr. We should handle that case. I figured this out with layer_shell.dart

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@mattkae
mattkae requested a review from robert-ancell July 8, 2026 20:13
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mattkae requested a review from a team as a code owner July 8, 2026 20:13
@flutter-dashboard flutter-dashboard Bot added the CICD Run CI/CD label Jul 8, 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.

@github-actions github-actions Bot added engine flutter/engine related. See also e: labels. platform-linux Building on or for Linux specifically a: desktop Running on desktop team-linux Owned by the Linux platform team labels Jul 8, 2026

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Code Review

This pull request adds a null check for the final_rect parameter in the moved_to_rect_cb callback within fl_window_monitor.cc to prevent potential null pointer dereferences when the backend cannot obtain the rectangle. There are no review comments, and I have no additional feedback to provide.

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In the current code this is fine to ignore (we only store the x,y coordinates). Potentially in the future we would change on_moved_to_rect to report this (0 sized rectangle?) or add an on_moved that has no rectangle.

@robert-ancell
robert-ancell enabled auto-merge July 8, 2026 21:06
@robert-ancell
robert-ancell added this pull request to the merge queue Jul 9, 2026
Merged via the queue into flutter:master with commit 4402c9a Jul 9, 2026
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@robert-ancell
robert-ancell deleted the moved-to-rect-null-check branch July 9, 2026 18:04
auto-submit Bot pushed a commit to flutter/packages that referenced this pull request Jul 10, 2026
…12169)

Manual roll Flutter from 91939cc4db78 to dc2a8703e12b (50 revisions)

Manual roll requested by [email protected]

flutter/flutter@91939cc...dc2a870

2026-07-09 [email protected] [ios,macos] Update swiftc.py flags to match swiftc (flutter/flutter#189174)
2026-07-09 [email protected] [AGP 9] Update Warn Version to AGP 9+ (flutter/flutter#189109)
2026-07-09 [email protected] Sync CHANGELOG.md from stable (flutter/flutter#189203)
2026-07-09 [email protected] [web] Roll Chrome to 145 (framework) (flutter/flutter#182861)
2026-07-09 [email protected] Roll Packages from 52d84d6 to 20928d5 (6 revisions) (flutter/flutter#189194)
2026-07-09 [email protected] [web] Avoid absolute positioning for base CanvasKit canvas (flutter/flutter#188337)
2026-07-09 [email protected] Roll Dart SDK from cdb7217e65aa to a11fb7ed40a5 (6 revisions) (flutter/flutter#189195)
2026-07-09 [email protected] Fix dereference of nullptr in the moved-to-rect signal in the Linux embedder (flutter/flutter#189152)
2026-07-09 [email protected] Fix data for design packages (flutter/flutter#189140)
2026-07-09 [email protected] Roll Skia from 7b42d1251d54 to ab3a7b98c94d (2 revisions) (flutter/flutter#189181)
2026-07-09 [email protected] Roll Skia from 05d9d214e0b7 to 7b42d1251d54 (2 revisions) (flutter/flutter#189175)
2026-07-09 [email protected] Roll Skia from 542c8bdd7f4f to 05d9d214e0b7 (4 revisions) (flutter/flutter#189169)
2026-07-09 [email protected] UberSDF rect handling for thin (line-like) rectangles (flutter/flutter#188821)
2026-07-09 [email protected] Roll Skia from dd572c07f63c to 542c8bdd7f4f (4 revisions) (flutter/flutter#189160)
2026-07-09 [email protected] [flutter_tools] Fix hot restart for WASM web builds (flutter/flutter#187898)
2026-07-08 [email protected] Split FlViewRenderer into OpenGL and software backends (flutter/flutter#188824)
2026-07-08 [email protected] Promote android_hardware_smoke_tests out of bringup in CI (flutter/flutter#189081)
2026-07-08 [email protected] Roll Skia from 8df24be66531 to dd572c07f63c (4 revisions) (flutter/flutter#189150)
2026-07-08 [email protected] Expose LinuxWindowRegistrar on _window_linux.dart in order to better support out of tree LinuxWindowingOwners (flutter/flutter#188917)
2026-07-08 [email protected] Roll pub packages (flutter/flutter#189149)
2026-07-08 [email protected] fix(ci): harden some workflows (flutter/flutter#189087)
2026-07-08 [email protected] Roll Skia from 51a62da33da0 to 8df24be66531 (1 revision) (flutter/flutter#189139)
2026-07-08 [email protected] Roll Dart SDK to Dart 3.13 beta3 (flutter/flutter#189122)
2026-07-08 [email protected] [flutter_tools] Don't crash on non-UTF-8 plugin pubspec.yaml (flutter/flutter#188976)
2026-07-08 [email protected] [flutter_tools] Watch transitive #include headers for FragmentProgram hot reload (flutter/flutter#187945)
2026-07-08 [email protected] Roll Skia from 040d9f55de00 to 51a62da33da0 (1 revision) (flutter/flutter#189135)
2026-07-08 [email protected] Roll Packages from 92525f5 to 52d84d6 (7 revisions) (flutter/flutter#189134)
2026-07-08 [email protected] [flutter_tools] Forcefully kill hung subprocesses 5 seconds after timeout (flutter/flutter#187178)
2026-07-08 [email protected] Expose the app's build name and number as compile-time constants (flutter/flutter#187935)
2026-07-08 [email protected] Roll Skia from 1ff92f879815 to 040d9f55de00 (1 revision) (flutter/flutter#189131)
2026-07-08 [email protected] Roll Skia from 6137414bef5c to 1ff92f879815 (6 revisions) (flutter/flutter#189126)
2026-07-08 [email protected] [test cross imports] More test/rendering + flutter_test/test fixes (flutter/flutter#188954)
2026-07-08 [email protected] engine: explain why each candidate build was skipped in Flutter web loader (flutter/flutter#186254)
2026-07-08 [email protected] vscode: add missing unicode.h (flutter/flutter#189102)
2026-07-08 [email protected] Roll Fuchsia Linux SDK from 7RjQJBW3m-3Jl-7jr... to QcRFUtvCw2EobfJ8s... (flutter/flutter#189104)
2026-07-08 [email protected] Roll Skia from 075fbe4778d9 to 6137414bef5c (10 revisions) (flutter/flutter#189106)
2026-07-08 [email protected] engine: warn on WASM load failure when not crossOriginIsolated (flutter/flutter#186252)
2026-07-08 [email protected] Roll Dart SDK from c9bccc09e733 to db2155f56bf3 (2 revisions) (flutter/flutter#189105)
2026-07-08 [email protected] [flutter_tools] Prevent interactive device selection in machine mode (flutter/flutter#188267)
2026-07-08 [email protected] [flutter_tools] Fix wireless ADB device discovery when serial contains spaces (flutter/flutter#187943)
2026-07-07 [email protected] [web] Fix grouped autofill on iOS Chrome (flutter/flutter#187459)
2026-07-07 [email protected] Fix TextSelectionOverlay crash when layout is degenerate (flutter/flutter#188672)
2026-07-07 [email protected] [flutter_tools] Provision Android NDK in the main Gradle invocation (flutter/flutter#186337)
2026-07-07 [email protected] Android_hardware_smoke_test: Migrate to AGP 9 (flutter/flutter#189082)
...
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