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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2022-12-22 10:35:03 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2022-12-22 10:35:03 -0500 |
| commit | d572003f74bb6bddac1c0eaf7fb5d0c4af1a3890 (patch) | |
| tree | 43d2c450c01e04546f7f6f31ee343ce4d055b052 /src/backend/executor/nodeAgg.c | |
| parent | c8314d62a9bda3cb55dfea90ec5130713288058a (diff) | |
| download | postgresql-d572003f74bb6bddac1c0eaf7fb5d0c4af1a3890.tar.gz postgresql-d572003f74bb6bddac1c0eaf7fb5d0c4af1a3890.zip | |
Add some recursion and looping defenses in prepjointree.c.
Andrey Lepikhov demonstrated a case where we spend an unreasonable
amount of time in pull_up_subqueries(). Not only is that recursing
with no explicit check for stack overrun, but the code seems not
interruptable by control-C. Let's stick a CHECK_FOR_INTERRUPTS
there, along with sprinkling some stack depth checks.
An actual fix for the excessive time consumption seems a bit
risky to back-patch; but this isn't, so let's do so.
Discussion: https://postgr.es/m/703c09a2-08f3-d2ec-b33d-dbecd62428b8@postgrespro.ru
Diffstat (limited to 'src/backend/executor/nodeAgg.c')
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