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zeroize: fix fallback code used by optimization_barrier #1551

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Merged
newpavlov merged 2 commits into from
Oct 6, 2026
Merged

zeroize: fix fallback code used by optimization_barrier #1551

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zeroize: fix fallback code used by `optimization_barrier`
newpavlov Oct 6, 2026
e41fcea
Add changelog entry
newpavlov Oct 6, 2026
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2 changes: 2 additions & 0 deletions zeroize/CHANGELOG.md
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Expand Up @@ -7,8 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
## 1.9.1 (UNRELEASED)
### Fixed
- False positive failures in proxy allocator test ([#1538])
- Potential uninitialized memory read in fallback code used by `optimization_barrier` ([#1551])

[#1538]: https://github.com/RustCrypto/utils/pull/1538
[#1551]: https://github.com/RustCrypto/utils/pull/1551

## 1.9.0 (2026-06-12)
### Added
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4 changes: 3 additions & 1 deletion zeroize/src/barrier.rs
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Expand Up @@ -91,7 +91,9 @@ pub fn optimization_barrier<T: ?Sized>(val: &T) {
/// `#[inline(never)]` and `read_volatile`.
#[inline(never)]
fn custom_black_box(p: *const u8) {
let _ = unsafe { core::ptr::read_volatile(p) };
use core::mem::MaybeUninit;

let _: MaybeUninit<u8> = unsafe { core::ptr::read_volatile(p.cast()) };
}

core::hint::black_box(val);
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