From: Anton Gladky <gladk@debian.org>
Date: Mon, 27 Jul 2026 14:37:42 +0000 (+0200)
Subject: Fix segfault writing ascii .vtu files with implicit cell type arrays
X-Git-Tag: archive/raspbian/9.6.2+dfsg1-4+rpi1^2^2~1
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=189cbcaeee5ceb9794188f01686471e0fa9c4106;p=vtk9.git

Fix segfault writing ascii .vtu files with implicit cell type arrays

Forwarded: not-yet

NewIterator() returns nullptr for the implicit cell-type arrays used
since VTK 9.6. WriteAsciiData() dereferenced that nullptr via an
unconditional iter->Delete(). Guard it. Closes yade FTBFS.

Gbp-Pq: Name fix_xmlwriter_ascii_implicit_cellarray_segfault.patch
---

diff --git a/IO/XML/vtkXMLWriter.cxx b/IO/XML/vtkXMLWriter.cxx
index 413f0f885..030e96cb7 100644
--- a/IO/XML/vtkXMLWriter.cxx
+++ b/IO/XML/vtkXMLWriter.cxx
@@ -1978,7 +1978,10 @@ int vtkXMLWriter::WriteAsciiData(vtkAbstractArray* a, vtkIndent indent)
       ret = 0;
       break;
   }
-  iter->Delete();
+  if (iter)
+  {
+    iter->Delete();
+  }
   return ret;
 }