[ARROW-11767] [C++] Scalar::hash may segfault for null scalars

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0
• Fix Version/s: 4.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/27619
• Assignee: Ben Kietzman
• Reporter: Ben Kietzman
• Created: 24/Feb/21 18:10
• Updated: 11/Jan/23 08:21
• Resolved: 24/Feb/21 22:12

Description

Scalar::Hash does not check Scalar::is_valid, which can result in inconsistent hashes when applied to uninitialized /.*Scalar::value/ or may segfault (since null binary scalars may have a null buffer).

Issue Links

• links to: GitHub Pull Request #9562