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| author | bors <bors@rust-lang.org> | 2023-08-29 07:53:56 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2023-08-29 07:53:56 +0000 |
| commit | f6faef447536204549eb47f12884d3e229fe87d3 (patch) | |
| tree | 7b3f2907e6a4134b4b34037485ce71844b529196 /compiler/rustc_codegen_llvm/src/context.rs | |
| parent | cedbe5c715c1fa9359683c5f108bed2054ac258b (diff) | |
| parent | e7a1e4271d3c65fb707518d89890195faab29efe (diff) | |
| download | rust-f6faef447536204549eb47f12884d3e229fe87d3.tar.gz rust-f6faef447536204549eb47f12884d3e229fe87d3.zip | |
Auto merge of #114795 - RalfJung:cell-swap, r=dtolnay
make Cell::swap panic if the Cells partially overlap
The following function ought to be sound:
```rust
fn as_cell_of_array<T, const N: usize>(c: &[Cell<T>; N]) -> &Cell<[T; N]> {
unsafe { transmute(c) }
}
```
However, due to `Cell::swap`, it currently is not -- safe code can [cause a use-after-free](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2018&gist=c9415799722d985ff7d2c2c997b724ca). This PR fixes that.
Fixes https://github.com/rust-lang/rust/issues/80778
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/context.rs')
0 files changed, 0 insertions, 0 deletions