[jira] [Resolved] (ORC-2161) [C++] UnionColumnReader should reject out-of-range union tags

["Gang Wu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ORC-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gang Wu resolved ORC-2161.
--------------------------
    Fix Version/s: 2.2.3
                   2.3.1
       Resolution: Fixed

> [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
>             Fix For: 2.2.3, 2.3.1
>
>
> 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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