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Check criticalSharedRelcachesBuilt in GetSharedSecurityLabel().

An extension may want to call GetSecurityLabel() on a shared objectbefore the shared relcaches are fully initialized. For instance, aClientAuthentication_hook might want to retrieve the security label ona role.Discussion:https://postgr.es/m/ecb7af0b26e3be1d96d291c8453a86f1f82d9061.camel@j-davis.comBackpatch-through: 9.6

1 parentfdd6a4d commit20f7857Copy full SHA for 20f7857

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src/backend/commands
- seclabel.c

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`‎src/backend/commands/seclabel.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -169,8 +169,8 @@ GetSharedSecurityLabel(const ObjectAddress object, const char provider)`
`169`	`169`
`170`	`170`	`pg_shseclabel=table_open(SharedSecLabelRelationId,AccessShareLock);`
`171`	`171`
`172`		`-scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId, true,`
`173`		`-NULL,3,keys);`
	`172`	`+scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId,`
	`173`	`+criticalSharedRelcachesBuilt,NULL,3,keys);`
`174`	`174`
`175`	`175`	`tuple=systable_getnext(scan);`
`176`	`176`	`if (HeapTupleIsValid(tuple))`

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Commit20f7857

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`‎src/backend/commands/seclabel.c`

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