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Robustify tuplesort's free_sort_tuple function

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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
This commit is contained in:
David Rowley
2021-07-13 13:30:26 +12:00
parent 6f1c7a2d0f
commit 645c5d1193
1 changed files with 1 additions and 0 deletions

1
src/backend/utils/sort/tuplesort.c

@ -4589,5 +4589,6 @@ free_sort_tuple(Tuplesortstate *state, SortTuple *stup)
{
FREEMEM(state, GetMemoryChunkSpace(stup->tuple));
pfree(stup->tuple);
stup->tuple = NULL;
}
}