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-rw-r--r--src/backend/commands/sequence.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/commands/sequence.c b/src/backend/commands/sequence.c
index b0b211891c3..99c9f91cba5 100644
--- a/src/backend/commands/sequence.c
+++ b/src/backend/commands/sequence.c
@@ -145,6 +145,14 @@ DefineSequence(ParseState *pstate, CreateSeqStmt *seq)
RangeVarGetAndCheckCreationNamespace(seq->sequence, NoLock, &seqoid);
if (OidIsValid(seqoid))
{
+ /*
+ * If we are in an extension script, insist that the pre-existing
+ * object be a member of the extension, to avoid security risks.
+ */
+ ObjectAddressSet(address, RelationRelationId, seqoid);
+ checkMembershipInCurrentExtension(&address);
+
+ /* OK to skip */
ereport(NOTICE,
(errcode(ERRCODE_DUPLICATE_TABLE),
errmsg("relation \"%s\" already exists, skipping",