From 45da69371ebfc4d6982695e58791989660c1cc33 Mon Sep 17 00:00:00 2001
From: Jeff Davis <jdavis@postgresql.org>
Date: Fri, 12 Jan 2024 21:38:16 -0800
Subject: [PATCH] Fix memory leak in connection string validation.

Introduced in commit c3afe8cf5a.

Discussion: https://postgr.es/m/066a65233d3cb4ea27a9e0778d2f1d0dc764b222.camel@j-davis.com
Reviewed-by: Nathan Bossart, Tom Lane
Backpatch-through: 16
---
 src/backend/replication/libpqwalreceiver/libpqwalreceiver.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c b/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
index ead30f87c9..201c36cb22 100644
--- a/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
+++ b/src/backend/replication/libpqwalreceiver/libpqwalreceiver.c
@@ -284,10 +284,15 @@ libpqrcv_check_conninfo(const char *conninfo, bool must_use_password)
 		}
 
 		if (!uses_password)
+		{
+			/* malloc'd, so we must free it explicitly */
+			PQconninfoFree(opts);
+
 			ereport(ERROR,
 					(errcode(ERRCODE_S_R_E_PROHIBITED_SQL_STATEMENT_ATTEMPTED),
 					 errmsg("password is required"),
 					 errdetail("Non-superusers must provide a password in the connection string.")));
+		}
 	}
 
 	PQconninfoFree(opts);