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https://issues.apache.org/jira/browse/ORC-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gang Wu reassigned ORC-2161:
----------------------------
> [C++] UnionColumnReader should reject out-of-range union tags
> -------------------------------------------------------------
>
> Key: ORC-2161
> URL: https://issues.apache.org/jira/browse/ORC-2161
> Project: ORC
> Issue Type: Bug
> Reporter: Gang Wu
> Assignee: Gang Wu
> Priority: Major
>
> The C++ UnionColumnReader trusts union tag bytes decoded from the ORC DATA
> stream and uses them directly as indexes into per-child count arrays. For
> malformed ORC files, a union tag value greater than or equal to the number of
> union children causes out-of-bounds access instead of reporting invalid input.
> This affects:
> * UnionColumnReader::skip()
> * UnionColumnReader::nextInternal()
> * UnionColumnPrinter::printRow() has the same unchecked tag dispatch pattern
> The reader should validate each non-null union tag against
> type.getSubtypeCount() and throw ParseError when the tag is invalid.
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