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Avoid overflow in VecDeque::with_capacity_in(). #90010

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Merged
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Oct 21, 2021
Merged

Avoid overflow in VecDeque::with_capacity_in(). #90010

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2 changes: 1 addition & 1 deletion library/alloc/src/collections/vec_deque/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -543,9 +543,9 @@ impl<T, A: Allocator> VecDeque<T, A> {
/// ```
#[unstable(feature = "allocator_api", issue = "32838")]
pub fn with_capacity_in(capacity: usize, alloc: A) -> VecDeque<T, A> {
assert!(capacity < 1_usize << usize::BITS - 1, "capacity overflow");
// +1 since the ringbuffer always leaves one space empty
let cap = cmp::max(capacity + 1, MINIMUM_CAPACITY + 1).next_power_of_two();
assert!(cap > capacity, "capacity overflow");

VecDeque { tail: 0, head: 0, buf: RawVec::with_capacity_in(cap, alloc) }
}
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