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Added advisory for pyo3 reference counting issue

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Alex Gaynor
2020-11-28 15:43:56 -05:00
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commit b9eed83776
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "pyo3"
date = "2020-11-28"
url = "https://github.com/PyO3/pyo3/pull/1297"
keywords = ["memory-corruption"]
[versions]
patched = [">= 0.12.4"]
unaffected = ["< 0.12.0"]
```
# Reference counting error in `From<Py<T>>`
A bug in `From<Py<T>>` would lead to an extra reference count decrement, often
leading to use-after-free issues.