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Patch for undefined behaviour (nullpointer reference). #26

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Patch for undefined behaviour (nullpointer reference). #26

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4 changes: 4 additions & 0 deletions dccrg_mpi_support.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -185,6 +185,10 @@ class All_Gather
total_send_count += (uint64_t) send_count;
}

if(total_send_count == 0) {
//Early abort if there is nothing to communicate.
return;
}
std::vector<uint64_t> temp_result(total_send_count, std::numeric_limits<uint64_t>::max());

// give a sane address to gatherv also when nothing to send
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