lidavidm opened a new pull request #9801:
URL: https://github.com/apache/arrow/pull/9801


   This fixes an out-of-bounds write that mimalloc caught during free(). 
ListArray::FromArrays does some sanitization, but had an off-by-N error: for a 
length N array, given N + 1 offsets, it correctly copied N validity bits from 
the offset array, but then tried to clear the N+2nd bit. Usually this would be 
fine anyways, given that there would be extra bits/bytes in validity buffer, 
but not always.


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