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Check for interrupts and stack overflow during rule/view dumps.

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Since ruleutils.c recurses, it could be driven to stack overflow by
deeply nested constructs.  Very large queries might also take long
enough to deparse that a check for interrupts seems like a good idea.
Stick appropriate tests into a couple of key places.

Noted by Greg Stark.  Back-patch to all supported branches.
This commit is contained in:
Tom Lane 2014-04-30 13:46:19 -04:00
parent e2558e016e
commit 920fbc1b43
1 changed files with 13 additions and 0 deletions
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13
src/backend/utils/adt/ruleutils.c
View File

@ -35,6 +35,7 @@
#include "commands/tablespace.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "nodes/makefuncs.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/clauses.h"
@ -2661,6 +2662,10 @@ get_query_def(Query *query, StringInfo buf, List *parentnamespace,
deparse_context context;
deparse_namespace dpns;
/* Guard against excessively long or deeply-nested queries */
CHECK_FOR_INTERRUPTS();
check_stack_depth();
/*
* Before we begin to examine the query, acquire locks on referenced
* relations, and fix up deleted columns in JOIN RTEs. This ensures
@ -3178,6 +3183,10 @@ get_setop_query(Node *setOp, Query *query, deparse_context *context,
StringInfo buf = context->buf;
bool need_paren;
/* Guard against excessively long or deeply-nested queries */
CHECK_FOR_INTERRUPTS();
check_stack_depth();
if (IsA(setOp, RangeTblRef))
{
RangeTblRef *rtr = (RangeTblRef *) setOp;
@ -5001,6 +5010,10 @@ get_rule_expr(Node *node, deparse_context *context,
if (node == NULL)
return;
/* Guard against excessively long or deeply-nested queries */
CHECK_FOR_INTERRUPTS();
check_stack_depth();
/*
* Each level of get_rule_expr must emit an indivisible term
* (parenthesized if necessary) to ensure result is reparsed into the same