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Rollup merge of #75146 - tmiasko:range-overflow, r=Mark-Simulacrum

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Detect overflow in proc_macro_server subspan

* Detect overflow in proc_macro_server subspan
* Add tests for overflow in Vec::drain
* Add tests for overflow in String / VecDeque operations using ranges
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Dylan DPC 2020-09-16 01:30:30 +02:00 • committed by GitHub
commit fb9bb2b5ca
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5 changed files with 72 additions and 2 deletions
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4
compiler/rustc_expand/src/proc_macro_server.rs
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@ -584,12 +584,12 @@ impl server::Literal for Rustc<'_> {
let start = match start {
Bound::Included(lo) => lo,
Bound::Excluded(lo) => lo + 1,
Bound::Excluded(lo) => lo.checked_add(1)?,
Bound::Unbounded => 0,
};
let end = match end {
Bound::Included(hi) => hi + 1,
Bound::Included(hi) => hi.checked_add(1)?,
Bound::Excluded(hi) => hi,
Bound::Unbounded => length,
};