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fix: reject excessive AllocRingBuffer allocations #149

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fix: reject excessive AllocRingBuffer allocations #149

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16 changes: 13 additions & 3 deletions src/with_alloc/alloc_ringbuffer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -321,9 +321,19 @@ impl<T> AllocRingBuffer<T> {
#[must_use]
pub fn new(capacity: usize) -> Self {
assert_ne!(capacity, 0, "Capacity must be greater than 0");
let size = capacity.next_power_of_two();
let layout = alloc::alloc::Layout::array::<T>(size).unwrap();
let buf = unsafe { alloc::alloc::alloc(layout).cast() };
let size = capacity
.checked_next_power_of_two()
.expect("Capacity is too large");
let layout = alloc::alloc::Layout::array::<T>(size)
.expect("Capacity is too large");
assert!(
layout.size() <= (1usize << 40),
"Capacity is too large"
);
let buf: *mut T = unsafe { alloc::alloc::alloc(layout).cast() };
if buf.is_null() {
alloc::alloc::handle_alloc_error(layout);
}
Self {
buf,
size,
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