From 364b0e0563e04c0e297667eb7cff82f175d2125e Mon Sep 17 00:00:00 2001
From: Kevin Michel <kevin.michel@sereema.com>
Date: Mon, 4 May 2020 09:40:36 +0200
Subject: [PATCH] Fix memory leak in conn_set_client_encoding

If the specified encoding is the same as the current one,
the early exit did not release the clean_enc string allocated
by clear_encoding_name.
---
 psycopg/connection_int.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/psycopg/connection_int.c b/psycopg/connection_int.c
index 78dbd469..da8a4644 100644
--- a/psycopg/connection_int.c
+++ b/psycopg/connection_int.c
@@ -1389,7 +1389,10 @@ conn_set_client_encoding(connectionObject *self, const char *pgenc)
 
     /* If the current encoding is equal to the requested one we don't
        issue any query to the backend */
-    if (strcmp(self->encoding, clean_enc) == 0) return 0;
+    if (strcmp(self->encoding, clean_enc) == 0) {
+        res = 0;
+        goto exit;
+    }
 
     Py_BEGIN_ALLOW_THREADS;
     pthread_mutex_lock(&self->lock);