[release/9.0] Initialize managed and native values in the ICustomMarshaler marshaler to null when the other is null. #109096
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Backport of #109092 to release/9.0
/cc @jkoritzinsky
Customer Impact
Reported in #109033
User experience is uninitialized (or default initialized with a "random" sentinel) memory being passed to native code when the managed value is
null, leading to crashes in native code when usingMarshalAs(UnmanagedType.CustomMarshaler). Usage of this marshaler kind is relatively uncommon (not a default, explicitly opted in to), but for all usages, this case is likely to eventually show up.Regression
.NET 9 preview 2
Testing
Verified against the previous implementation.
Risk
Low. I've re-validated all of the code paths and their expected values against the previous implementation before the regression.