From c7681650a7a217d456fa6d0080398a403cf8ebaf Mon Sep 17 00:00:00 2001
From: Alessandro Pasotti <elpaso@itopen.it>
Date: Thu, 9 Jan 2025 16:20:49 +0100
Subject: [PATCH] return geom field seal error

---
 ogr/ogrgeomfielddefn.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ogr/ogrgeomfielddefn.cpp b/ogr/ogrgeomfielddefn.cpp
index aacece2482b2..9942cf2c8ec1 100644
--- a/ogr/ogrgeomfielddefn.cpp
+++ b/ogr/ogrgeomfielddefn.cpp
@@ -565,6 +565,15 @@ OGRSpatialReferenceH OGR_GFld_GetSpatialRef(OGRGeomFieldDefnH hDefn)
  */
 void OGRGeomFieldDefn::SetSpatialRef(const OGRSpatialReference *poSRSIn)
 {
+
+    if (m_bSealed)
+    {
+        CPLError(
+            CE_Failure, CPLE_AppDefined,
+            "OGRGeomFieldDefn::SetSpatialRef() not allowed on a sealed object");
+        return;
+    }
+
     if (poSRS == poSRSIn)
     {
         return;