Skip to content

Don't drop uninit memory when MapWindows::clone panics#156588

Open
Jules-Bertholet wants to merge 3 commits into
rust-lang:mainfrom
Jules-Bertholet:fix-panicky-mapwindows-clone
Open

Don't drop uninit memory when MapWindows::clone panics#156588
Jules-Bertholet wants to merge 3 commits into
rust-lang:mainfrom
Jules-Bertholet:fix-panicky-mapwindows-clone

Conversation

@Jules-Bertholet
Copy link
Copy Markdown
Contributor

Fixes #156501, using the approach suggested in @bjorn3's comment #156517 (comment)

@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented May 14, 2026

The Miri subtree was changed

cc @rust-lang/miri

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 14, 2026
@rustbot
Copy link
Copy Markdown
Collaborator

rustbot commented May 14, 2026

r? @scottmcm

rustbot has assigned @scottmcm.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

  • Owners of files modified in this PR: @scottmcm, libs
  • @scottmcm, libs expanded to 8 candidates
  • Random selection from Mark-Simulacrum, scottmcm

Comment thread src/tools/miri/tests/pass/issues/issue-156501-mapwindows-panicking-clone.rs Outdated
Comment thread library/core/src/iter/adapters/map_windows.rs Outdated
Comment on lines +43 to +44
//
// FIXME make these unsafe fields once that feature is ready
Copy link
Copy Markdown
Member

@RalfJung RalfJung May 15, 2026

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Suggested change
//
// FIXME make these unsafe fields once that feature is ready

I don't think it's worth adding this FIXME to very single type with an invariant.

View changes since the review

Jules-Bertholet and others added 2 commits May 15, 2026 10:10
Co-authored-by: Ralf Jung <post@ralfj.de>
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue.

Projects

None yet

Development

Successfully merging this pull request may close these issues.

MapWindows::clone is not panic-safe; panicking T::clone causes uninitialized memory to be dropped

4 participants