Fix in stable_distribute function. #27
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Only dereference iterators that are guaranteed to point to an allocated address.
patflick
approved these changes
Jun 5, 2021
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Problem: The
mxx::stable_distributefunction callsmxx::all2allvby dereferencing thebegininput iterator. This may lead to undefined behavior (possibly segfault) if the iterator is for an empty container, sincebeginwill be the same asenditerator in such cases.Solution: Only dereference iterators that are guaranteed to point to allocated addresses.