From b8f93b4ce2a7178d81d481c1b9557f7ca7569078 Mon Sep 17 00:00:00 2001
From: Gregory Oschwald <goschwald@maxmind.com>
Date: Thu, 23 Jan 2025 15:01:08 -0800
Subject: [PATCH] Check MMDB_get_metadata_as_entry_data_list return value

---
 HISTORY.rst           | 2 ++
 extension/maxminddb.c | 9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/HISTORY.rst b/HISTORY.rst
index 0456b44..4f262dc 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -7,6 +7,8 @@ History
 ++++++++++++++++++
 
 * The vendored ``libmaxminddb`` has been updated to 1.12.2.
+* The C extension now checks that the database metadata lookup was
+  successful.
 
 2.6.3 (2025-01-09)
 ++++++++++++++++++
diff --git a/extension/maxminddb.c b/extension/maxminddb.c
index d685792..5faf045 100644
--- a/extension/maxminddb.c
+++ b/extension/maxminddb.c
@@ -351,7 +351,14 @@ static PyObject *Reader_metadata(PyObject *self, PyObject *UNUSED(args)) {
     }
 
     MMDB_entry_data_list_s *entry_data_list;
-    MMDB_get_metadata_as_entry_data_list(mmdb_obj->mmdb, &entry_data_list);
+    int status =
+        MMDB_get_metadata_as_entry_data_list(mmdb_obj->mmdb, &entry_data_list);
+    if (status != MMDB_SUCCESS) {
+        PyErr_Format(MaxMindDB_error,
+                     "Error decoding metadata. %s",
+                     MMDB_strerror(status));
+        return NULL;
+    }
     MMDB_entry_data_list_s *original_entry_data_list = entry_data_list;
 
     PyObject *metadata_dict = from_entry_data_list(&entry_data_list);