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Fix undefined behavior #57511

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merged 1 commit into from Jan 12, 2019

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jethrogb commented Jan 11, 2019

From the MaybeUninit::get_mut docs:

It is up to the caller to guarantee that the the MaybeUninit really is in an initialized state, otherwise this will immediately cause undefined behavior.

r? @joshtriplett

Jethro Beekman
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cramertj commented Jan 11, 2019

@bors r+ rollup

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bors commented Jan 11, 2019

📌 Commit 928efca has been approved by cramertj

Centril added a commit to Centril/rust that referenced this pull request Jan 12, 2019

Rollup merge of rust-lang#57511 - jethrogb:jb/fix-undef, r=cramertj
Fix undefined behavior

From the [`MaybeUninit::get_mut` docs](https://doc.rust-lang.org/std/mem/union.MaybeUninit.html):
> It is up to the caller to guarantee that the the MaybeUninit really is in an initialized state, otherwise this will immediately cause undefined behavior.

r? @joshtriplett

bors added a commit that referenced this pull request Jan 12, 2019

Auto merge of #57542 - Centril:rollup, r=Centril
Rollup of 26 pull requests

Successful merges:

 - #56425 (Redo the docs for Vec::set_len)
 - #56906 (Issue #56905)
 - #57042 (Don't call `FieldPlacement::count` when count is too large)
 - #57175 (Stabilize `let` bindings and destructuring in constants and const fn)
 - #57192 (Change std::error::Error trait documentation to talk about `source` instead of `cause`)
 - #57296 (Fixed the link to the ? operator)
 - #57368 (Use CMAKE_{C,CXX}_COMPILER_LAUNCHER for ccache)
 - #57400 (Rustdoc: update Source Serif Pro and replace Heuristica italic)
 - #57417 (rustdoc: use text-based doctest parsing if a macro is wrapping main)
 - #57433 (Add link destination for `read-ownership`)
 - #57434 (Remove `CrateNum::Invalid`.)
 - #57441 (Supporting backtrace for x86_64-fortanix-unknown-sgx.)
 - #57450 (actually take a slice in this example)
 - #57459 (Reference tracking issue for inherent associated types in diagnostic)
 - #57463 (docs: Fix some 'second-edition' links)
 - #57466 (Remove outdated comment)
 - #57493 (use structured suggestion when casting a reference)
 - #57498 (make note of one more normalization that Paths do)
 - #57499 (note that FromStr does not work for borrowed types)
 - #57505 (Remove submodule step from README)
 - #57510 (Add a profiles section to the manifest)
 - #57511 (Fix undefined behavior)
 - #57519 (Correct RELEASES.md for 1.32.0)
 - #57522 (don't unwrap unexpected tokens in `format!`)
 - #57530 (Fixing a typographical error.)
 - #57535 (Stabilise irrefutable if-let and while-let patterns)

Failed merges:

r? @ghost

@bors bors merged commit 928efca into rust-lang:master Jan 12, 2019

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