[57_maintenance] Prevent FixedSizeBinaryArray i32 offset overflows (#9872)#9928
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alamb merged 1 commit intoapache:57_maintenancefrom May 6, 2026
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…#9872) - Closes apache#9850 `FixedSizeBinaryArray::value_offset_at` works use `i32` arithmetic which can overflow. For offsets beyond `i32::MAX`, that can be bad 1. Prevent any FixedSizedBinaryArrays from being constructed where the offset calculation could overflow 2. Add some other overflow checks As @adamreeve [pointed out](apache#9850 (comment)) on apache#9850 there are several places where the `i32` arithmetic is problematic in `FixedSizeBinaryArray`. I will fix them for real in a different, follow on PR, by switching to entirely `usize` based arithmetic for offset calculations However, since I hope to backport this PR to older releases, I would like something that is easy to review and has the least potential for unintended consequences. I added unit tests. However, I can't find any way to fully trigger the actual paths short of trying to allocate very large arrays, which I don't think is appropriate for unit tests. Better limit checking
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57.3.1(May 2026) #9858This PR:
FixedSizeBinaryArrayi32offset overflows (try 2) #9872 from @alamb to the57_maintenancelineFixedSizeBinaryArray::valueoffset truncation #9850 referenced by the issue