tustvold commented on code in PR #6616:
URL: https://github.com/apache/arrow-rs/pull/6616#discussion_r1812213784
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arrow-select/src/take.rs:
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@@ -2382,4 +2389,29 @@ mod tests {
let array = take(&array, &indicies, None).unwrap();
assert_eq!(array.len(), 3);
}
+
+ #[test]
+ fn test_take_bytes_null_indices_modified() {
+ let indices = Int32Array::new(
+ vec![0, 0, 0, 0].into(),
+ Some(NullBuffer::from_iter(vec![false, true, true, true])),
+ );
+ let values = StringArray::from(vec![Some("foo")]);
+ let r = take(&values, &indices, None).unwrap();
+
+ // Modify indices null buffer
+ let (_, _, nulls) = indices.into_parts();
+ assert!(nulls.is_some());
+ let null_buffer = nulls.unwrap();
+ let binding = null_buffer.into_inner().into_inner();
+ let null_slice = binding.data_ptr();
+ for i in 0..4 {
+ unsafe {
+ bit_util::unset_bit_raw(null_slice.as_ptr(), i);
Review Comment:
I believe this is UB, you're mutating a pointer you don't have exclusive
access to
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