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https://issues.apache.org/jira/browse/ARROW-8728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-8728.
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Resolution: Fixed
> [C++] Bitmap operation may cause buffer overflow
> -------------------------------------------------
>
> Key: ARROW-8728
> URL: https://issues.apache.org/jira/browse/ARROW-8728
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Yibo Cai
> Assignee: Yibo Cai
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.18.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> Happen to find this issue when refining bitmap operation, [this
> code|https://github.com/apache/arrow/blob/9b75a60658327c39383bee48fa6e5827faf2ced3/cpp/src/arrow/util/bit_util.cc#L267]
> may overflow out buffer. Should be "(length + left_offset % 8)";
> Improve unit test to test large offset values can trigger the bug.
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