[jira] [Resolved] (IMPALA-15377) ASAN heap-buffer-overflow in ParquetDeltaEncoder for empty pages

["Michael Smith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-15377?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Smith resolved IMPALA-15377.
------------------------------------
    Fix Version/s: Impala 5.0.0
       Resolution: Fixed

> ASAN heap-buffer-overflow in ParquetDeltaEncoder for empty pages
> ----------------------------------------------------------------
>
>                 Key: IMPALA-15377
>                 URL: https://issues.apache.org/jira/browse/IMPALA-15377
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Backend
>            Reporter: Michael Smith
>            Assignee: Michael Smith
>            Priority: Major
>             Fix For: Impala 5.0.0
>
>
> {{ParquetDeltaEncoder::FinalizePage()}} unconditionally writes a page header even when zero values have been written (\{{total_value_count_ == 0}}), using an uninitialized {{first_value_}} and requiring more space than {{WorstCaseOutputSize(0) }}(which returns 0) reserves. This caused a heap-buffer-overflow write in BitWriter::PutAligned via WriteHeader, hit by ParquetDeltaLengthByteArrayDecoderTest.EmptyPage on ASAN builds with newer Clang versions.



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