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Commit2fde8e4

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Robustify tuplesort's free_sort_tuple function
4146925 went to the trouble of removing a theoretical bug fromfree_sort_tuple by checking if the tuple was NULL before freeing it. Let'smake this a little more robust by also setting the tuple to NULL so thatshould we be called again we won't end up doing a pfree on the alreadypfree'd tuple. Per advice from Tom Lane.Discussion:https://postgr.es/m/3188192.1626136953@sss.pgh.pa.usBackpatch-through: 9.6, same as4146925
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‎src/backend/utils/sort/tuplesort.c

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@@ -4701,5 +4701,6 @@ free_sort_tuple(Tuplesortstate *state, SortTuple *stup)
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{
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FREEMEM(state,GetMemoryChunkSpace(stup->tuple));
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pfree(stup->tuple);
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stup->tuple=NULL;
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}
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}

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