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Add stack depth check to QueueFKConstraintValidation().

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QueueFKConstraintValidation() recurses through the partition hierarchy
to queue child constraint validations and to mark child rows as
validated.  With a sufficiently deep partition tree, this can result
in a stack-overflow crash.  Defend against that as we do elsewhere.

Bug: #19482
Reported-by: Alexander Lakhin <exclusion@gmail.com>
Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/19482-4cc37cbf52d55235@postgresql.org
Backpatch-through: 18
This commit is contained in:
Tom Lane 2026-05-26 11:58:25 -04:00
parent 1588d89af2
commit 61ea5cc6a6
1 changed files with 3 additions and 0 deletions
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3
src/backend/commands/tablecmds.c
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@ -13281,6 +13281,9 @@ QueueFKConstraintValidation(List **wqueue, Relation conrel, Relation fkrel,
HeapTuple copyTuple;
Form_pg_constraint copy_con;
/* since this function recurses, it could be driven to stack overflow */
check_stack_depth();
con = (Form_pg_constraint) GETSTRUCT(contuple);
Assert(con->contype == CONSTRAINT_FOREIGN);
Assert(!con->convalidated);