From bd70476897a16be21d5e26394c8c367d37e2c4c6 Mon Sep 17 00:00:00 2001
From: Alexandre Vassalotti <alexandre@peadrop.com>
Date: Sun, 13 Jul 2008 21:47:59 +0000
Subject: [PATCH] Issue #3153: sqlite leaks on error. Changed statements of the
 form Py_DECREF(obj), obj = 0 to Py_CLEAR(obj).

---
 Modules/_sqlite/connection.c | 27 +++++++++------------------
 Modules/_sqlite/cursor.c     |  8 +++-----
 2 files changed, 12 insertions(+), 23 deletions(-)

diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 8269e0b1fb2..2071c332127 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -1014,19 +1014,16 @@ PyObject* pysqlite_connection_call(pysqlite_Connection* self, PyObject* args, Py
             _pysqlite_seterror(self->db, NULL);
         }
 
-        Py_DECREF(statement);
-        statement = 0;
+        Py_CLEAR(statement);
     } else {
         weakref = PyWeakref_NewRef((PyObject*)statement, NULL);
         if (!weakref) {
-            Py_DECREF(statement);
-            statement = 0;
+            Py_CLEAR(statement);
             goto error;
         }
 
         if (PyList_Append(self->statements, weakref) != 0) {
-            Py_DECREF(weakref);
-            statement = 0;
+            Py_CLEAR(weakref);
             goto error;
         }
 
@@ -1050,15 +1047,13 @@ PyObject* pysqlite_connection_execute(pysqlite_Connection* self, PyObject* args,
 
     method = PyObject_GetAttrString(cursor, "execute");
     if (!method) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
         goto error;
     }
 
     result = PyObject_CallObject(method, args);
     if (!result) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
     }
 
 error:
@@ -1081,15 +1076,13 @@ PyObject* pysqlite_connection_executemany(pysqlite_Connection* self, PyObject* a
 
     method = PyObject_GetAttrString(cursor, "executemany");
     if (!method) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
         goto error;
     }
 
     result = PyObject_CallObject(method, args);
     if (!result) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
     }
 
 error:
@@ -1112,15 +1105,13 @@ PyObject* pysqlite_connection_executescript(pysqlite_Connection* self, PyObject*
 
     method = PyObject_GetAttrString(cursor, "executescript");
     if (!method) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
         goto error;
     }
 
     result = PyObject_CallObject(method, args);
     if (!result) {
-        Py_DECREF(cursor);
-        cursor = 0;
+        Py_CLEAR(cursor);
     }
 
 error:
diff --git a/Modules/_sqlite/cursor.c b/Modules/_sqlite/cursor.c
index 0d7d59a92f6..7c0ca4b6ece 100644
--- a/Modules/_sqlite/cursor.c
+++ b/Modules/_sqlite/cursor.c
@@ -545,7 +545,7 @@ PyObject* _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject*
         }
         rc = pysqlite_statement_create(self->statement, self->connection, operation);
         if (rc != SQLITE_OK) {
-            self->statement = 0;
+            Py_CLEAR(self->statement);
             goto error;
         }
     }
@@ -681,8 +681,7 @@ PyObject* _pysqlite_query_execute(pysqlite_Cursor* self, int multiple, PyObject*
             self->next_row = _pysqlite_fetch_one_row(self);
         } else if (rc == SQLITE_DONE && !multiple) {
             pysqlite_statement_reset(self->statement);
-            Py_DECREF(self->statement);
-            self->statement = 0;
+            Py_CLEAR(self->statement);
         }
 
         switch (statement_type) {
@@ -988,8 +987,7 @@ PyObject* pysqlite_cursor_close(pysqlite_Cursor* self, PyObject* args)
 
     if (self->statement) {
         (void)pysqlite_statement_reset(self->statement);
-        Py_DECREF(self->statement);
-        self->statement = 0;
+        Py_CLEAR(self->statement);
     }
 
     Py_INCREF(Py_None);