[jira] [Resolved] (ARROW-6572) [C++] Reading some Parquet data can return uninitialized memory

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6572?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou resolved ARROW-6572.
-----------------------------------
    Fix Version/s: 0.15.0
       Resolution: Fixed

Issue resolved by pull request 5392
[https://github.com/apache/arrow/pull/5392]

> [C++] Reading some Parquet data can return uninitialized memory
> ---------------------------------------------------------------
>
>                 Key: ARROW-6572
>                 URL: https://issues.apache.org/jira/browse/ARROW-6572
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 0.14.1
>            Reporter: Antoine Pitrou
>            Assignee: Antoine Pitrou
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 0.15.0
>
>          Time Spent: 1.5h
>  Remaining Estimate: 0h
>
> In https://github.com/apache/arrow/pull/5365 we found via a UBSAN issue that Parquet decoding of RLE-encoded dict-encoded Parquet data with nulls does not initialize the output data array for null entries. Since the output data array is generally a freshly-allocated memory buffer, this means it will contain uninitialized memory.



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