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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 | 4fceb454f2df57f63d05ccb4a26a9f49c377f28c (patch) | |
| tree | c194bfe3f3794b78e285d26287a9032a4e2b4d84 /src/backend/executor/nodeGroup.c | |
| parent | d35f1d485c392ce058382794742ce246e47643ec (diff) | |
| download | postgresql-4fceb454f2df57f63d05ccb4a26a9f49c377f28c.tar.gz postgresql-4fceb454f2df57f63d05ccb4a26a9f49c377f28c.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/nodeGroup.c')
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