bpo-45581: Raise MemoryError in sqlite3.connect if SQLite signals memory error (GH-29171)

Author: Erlend Egeberg Aasland

Misc/NEWS.d/next/Library/2021-10-22-21-57-02.bpo-45581.rlH6ay.rst

@@ -0,0 +1,2 @@
+:meth:`sqlite3.connect` now correctly raises :exc:`MemoryError` if the
+underlying SQLite API signals memory error. Patch by Erlend E. Aasland.

Modules/_sqlite/connection.c

@@ -165,6 +165,10 @@ pysqlite_connection_init_impl(pysqlite_Connection *self,
                          (uri ? SQLITE_OPEN_URI : 0), NULL);
     Py_END_ALLOW_THREADS
 
+    if (self->db == NULL && rc == SQLITE_NOMEM) {
+        PyErr_NoMemory();
+        return -1;
+    }
     if (rc != SQLITE_OK) {
         _pysqlite_seterror(state, self->db);
         return -1;