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Commitd03f331

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Ensure locks are acquired on RLS-added relations
During fireRIRrules(), get_row_security_policies can add tosecurityQuals and withCheckOptions. Make sure to lock any relationsadded at that point and before firing RIR rules on those expressions.Back-patch to 9.5 where RLS was added.
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‎src/backend/rewrite/rewriteHandler.c‎

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Original file line numberDiff line numberDiff line change
@@ -1787,6 +1787,8 @@ fireRIRrules(Query *parsetree, List *activeRIRs, bool forUpdatePushedDown)
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{
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if (hasSubLinks)
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{
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acquireLocksOnSubLinks_contextcontext;
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/*
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* Recursively process the new quals, checking for infinite
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* recursion.
@@ -1799,6 +1801,23 @@ fireRIRrules(Query *parsetree, List *activeRIRs, bool forUpdatePushedDown)
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activeRIRs=lcons_oid(RelationGetRelid(rel),activeRIRs);
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/*
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* get_row_security_policies just passed back securityQuals
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* and/or withCheckOptions, and there were SubLinks, make sure
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* we lock any relations which are referenced.
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*
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* These locks would normally be acquired by the parser, but
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* securityQuals and withCheckOptions are added post-parsing.
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*/
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context.for_execute= true;
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(void)acquireLocksOnSubLinks((Node*)securityQuals,&context);
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(void)acquireLocksOnSubLinks((Node*)withCheckOptions,
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&context);
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/*
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* Now that we have the locks on anything added by
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* get_row_security_policies, fire any RIR rules for them.
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*/
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expression_tree_walker((Node*)securityQuals,
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fireRIRonSubLink, (void*)activeRIRs);
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