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Prevent stack overflow when an encoder is registered from Python #1429

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Merged
lostmsu merged 3 commits into from
Mar 31, 2021
Merged

Prevent stack overflow when an encoder is registered from Python #1429

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aedcb88
added regression test for https://github.com/pythonnet/pythonnet/issu…
lostmsu Mar 30, 2021
ae3477d
disabled ability to register encoders for `System.Type`
lostmsu Mar 30, 2021
0d33a90
disabled PythonRegisteredDecoder_NoStackOverflowOnSystemType test due…
lostmsu Mar 31, 2021
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disabled ability to register encoders for System.Type 
Without this restriction encoders created in Python cause stack overflow due to repeated attempts to pass `System.Type` instance to `CanDecode`, which requires encoding the instance of `System.Type`, et. cetera

fixes #1427
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@lostmsu
lostmsu committed Mar 31, 2021
commit ae3477d63a0a6b6c20974b9a60d8a8fe4e7fd70e
1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -44,6 +44,7 @@ One must now either use enum members (e.g. `MyEnum.Option`), or use enum constru
- Sign Runtime DLL with a strong name
- Implement loading through `clr_loader` instead of the included `ClrModule`, enables
support for .NET Core
- BREAKING: custom encoders are no longer called for instances of `System.Type`

### Fixed

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7 changes: 5 additions & 2 deletions src/runtime/converter.cs
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Expand Up @@ -146,8 +146,11 @@ internal static IntPtr ToPython(object value, Type type)
return result;
}

if (Type.GetTypeCode(type) == TypeCode.Object && value.GetType() != typeof(object)
|| type.IsEnum) {
if (Type.GetTypeCode(type) == TypeCode.Object
&& value.GetType() != typeof(object)
&& value is not Type
|| type.IsEnum
) {
var encoded = PyObjectConversions.TryEncode(value, type);
if (encoded != null) {
result = encoded.Handle;
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