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Check for stack overrun in standard_ProcessUtility().

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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
This commit is contained in:
Tom Lane 2018-10-15 14:01:38 -04:00
parent a05f7053e8
commit ca361554c2
1 changed files with 3 additions and 0 deletions
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3
src/backend/tcop/utility.c
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@ -359,6 +359,9 @@ standard_ProcessUtility(Node *parsetree,
{ {
bool isTopLevel = (context == PROCESS_UTILITY_TOPLEVEL); bool isTopLevel = (context == PROCESS_UTILITY_TOPLEVEL);
/* This can recurse, so check for excessive recursion */
check_stack_depth();
check_xact_readonly(parsetree); check_xact_readonly(parsetree);
if (completionTag) if (completionTag)