Fix length when getting property from host #123774
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Pull request overview
Fixes incorrect SString length handling when reading runtime properties from the host by aligning buffer open/close semantics with the host contract’s “length includes null terminator” behavior.
Changes:
- Adjusts
OpenUTF8Buffersizing to account forSString’s implicit null terminator space. - Uses
CloseBuffer(finalCount)with the actual number of bytes written (excluding the null terminator). - Adds tighter failure handling for invalid/failed host property reads.
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AaronRobinsonMSFT
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Jan 29, 2026
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One nit. Other than that, nice job tracking this mess down.
agocke
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Jan 30, 2026
This was referenced Jan 30, 2026
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When getting a property from the host, we'd end up with a string length that was greater than the actual property length. Close the buffer with the actual length written.
cc @dotnet/appmodel @AaronRobinsonMSFT