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commit    d0e44bae4923cebe08fd03f8ac6cb42757eec480
Author:   David Rowley <drowley@postgresql.org>
Date:     Tue Jul 13 01:32:10 2021 +0000

    Robustify tuplesort's free_sort_tuple function
    
    41469253e went to the trouble of removing a theoretical bug from
    free_sort_tuple by checking if the tuple was NULL before freeing it. Let's
    make this a little more robust by also setting the tuple to NULL so that
    should we be called again we won't end up doing a pfree on the already
    pfree'd tuple. Per advice from Tom Lane.
    
    Discussion: https://postgr.es/m/3188192.1626136953@sss.pgh.pa.us
    Backpatch-through: 9.6, same as 41469253e


 src/backend/utils/sort/tuplesort.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/backend/utils/sort/tuplesort.c b/src/backend/utils/sort/tuplesort.c
index 015c197a77f..d1c29b2f043 100644
--- a/src/backend/utils/sort/tuplesort.c
+++ b/src/backend/utils/sort/tuplesort.c
@@ -4775,6 +4775,7 @@ writetup_datum(Tuplesortstate *state, int tapenum, SortTuple *stup)
 	{
 		FREEMEM(state, GetMemoryChunkSpace(stup->tuple));
 		pfree(stup->tuple);
+		stup->tuple = NULL;
 	}
 }
 


[parent: 87b7a652b3a2]