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io: fix safety of LinkedList drain_filter API (#5832)

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The `drain_filter` method on the internal `LinkedList` type passes a
`&mut` reference to the node type. However, the `LinkedList` is intended
to be used with nodes that are shared in other ways. For example
`task::Header` is accessible concurrently from multiple threads.

Currently, the only usage of `drain_filter` is in a case where `&mut`
access is safe, so this change is to help prevent future bugs and
tighten up the safety of internal utilities.
This commit is contained in:
Carl Lerche 2023-06-28 12:23:08 -07:00 committed by GitHub
parent 1bfe778acb
commit ec1f52e1d3
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1 changed files with 2 additions and 2 deletions
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4
tokio/src/util/linked_list.rs
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@ -307,7 +307,7 @@ cfg_io_driver_impl! {
impl<T: Link> LinkedList<T, T::Target> {
pub(crate) fn drain_filter<F>(&mut self, filter: F) -> DrainFilter<'_, T, F>
where
F: FnMut(&mut T::Target) -> bool,
F: FnMut(&T::Target) -> bool,
{
let curr = self.head;
DrainFilter {
@ -321,7 +321,7 @@ cfg_io_driver_impl! {
impl<'a, T, F> Iterator for DrainFilter<'a, T, F>
where
T: Link,
F: FnMut(&mut T::Target) -> bool,
F: FnMut(&T::Target) -> bool,
{
type Item = T::Handle;