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Add advisory for data race in generator (#855)

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Ammar Askar
2021-03-30 11:08:34 -04:00
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "generator"
date = "2020-11-16"
url = "https://github.com/Xudong-Huang/generator-rs/issues/27"
categories = ["memory-corruption"]
keywords = ["concurrency"]
[versions]
patched = [">= 0.7.0"]
```
# Generators can cause data races if non-Send types are used in their generator functions
The `Generator` type is an iterable which uses a generator function that yields
values. In affected versions of the crate, the provided function yielding values
had no `Send` bounds despite the `Generator` itself implementing `Send`.
The generator function lacking a `Send` bound means that types that are
dangerous to send across threads such as `Rc` could be sent as part of a
generator, potentially leading to data races.
This flaw was fixed in commit [`f7d120a3b`](https://github.com/Xudong-Huang/generator-rs/commit/f7d120a3b724d06a7b623d0a4306acf8f78cb4f0)
by enforcing that the generator function be bound by `Send`.