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Posted to issues@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2019/09/16 15:24:00 UTC

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

Antoine Pitrou created ARROW-6572:
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             Summary: [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


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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