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Add overflow check to arc::Weak::upgrade #30040

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Merged
merged 1 commit into from
Nov 25, 2015
Merged

Add overflow check to arc::Weak::upgrade #30040

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5 changes: 5 additions & 0 deletions src/liballoc/arc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -637,6 +637,11 @@ impl<T: ?Sized> Weak<T> {
return None
}

// See comments in `Arc::clone` for why we do this (for `mem::forget`).
if n > MAX_REFCOUNT {
unsafe { abort(); }
}

// Relaxed is valid for the same reason it is on Arc's Clone impl
let old = inner.strong.compare_and_swap(n, n + 1, Relaxed);
if old == n {
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