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Check for stack overrun in standard_ProcessUtility().
ProcessUtility can recurse, and indeed can be driven to infinite recursion, so it ought to have a check_stack_depth() call. This covers the reported bug (portal trying to execute itself) and a bunch of other cases that could perhaps arise somewhere. Per bug #15428 from Malthe Borch. Back-patch to all supported branches. Discussion: https://postgr.es/m/15428-b3c2915ec470b033@postgresql.org
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@ -387,6 +387,9 @@ standard_ProcessUtility(PlannedStmt *pstmt,
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bool isAtomicContext = (!(context == PROCESS_UTILITY_TOPLEVEL || context == PROCESS_UTILITY_QUERY_NONATOMIC) || IsTransactionBlock());
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ParseState *pstate;
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/* This can recurse, so check for excessive recursion */
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check_stack_depth();
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check_xact_readonly(parsetree);
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if (completionTag)
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