[PR] ORC-2196: [C++] Validate type tree when creating reader from serialized file tail [orc]

["dongjoon-hyun (via GitHub)" <gi...@apache.org>]

dongjoon-hyun opened a new pull request, #2679:
URL: https://github.com/apache/orc/pull/2679

   ### What changes were proposed in this pull request?
   
   This PR aims to validate the ORC type tree in `createReader` when the footer comes from a serialized file tail (`ReaderOptions.setSerializedFileTail`), by calling the existing `checkProtoTypes` in the same way as the file-read path.
   
   ### Why are the changes needed?
   
   The serialized-file-tail branch of `createReader` builds `contents->footer` directly from the parsed `proto::FileTail` without validation. A malformed footer with an out-of-range or back-referencing subtype flows into `convertType`, causing an out-of-bounds read or unbounded recursion (stack overflow) in release builds.
   
   The file-read path already validates via `checkProtoTypes`, and the Java reader validates both tail paths (`OrcTail` and `ReaderImpl`). This closes the remaining C++ parity gap.
   
   ### How was this patch tested?
   
   Pass the CIs with a newly added test case.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Fable 5


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Re: [PR] ORC-2196: [C++] Validate type tree when creating reader from serialized file tail [orc]

["dongjoon-hyun (via GitHub)" <gi...@apache.org>]

dongjoon-hyun closed pull request #2679: ORC-2196: [C++] Validate type tree when creating reader from serialized file tail
URL: https://github.com/apache/orc/pull/2679


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