From 08e6bc0e6a4450882b32d293f25f1277b261914e Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 21 Sep 2012 11:54:35 +0200
Subject: [PATCH] 0000545: Undo revolve causes crash illegal storage

---
 src/Mod/Part/Gui/SoBrepShape.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/Mod/Part/Gui/SoBrepShape.cpp b/src/Mod/Part/Gui/SoBrepShape.cpp
index 39658d073..2a9c2c4cb 100644
--- a/src/Mod/Part/Gui/SoBrepShape.cpp
+++ b/src/Mod/Part/Gui/SoBrepShape.cpp
@@ -1178,6 +1178,12 @@ SoBrepPointSet::SoBrepPointSet()
 
 void SoBrepPointSet::GLRender(SoGLRenderAction *action)
 {
+    const SoCoordinateElement* coords = SoCoordinateElement::getInstance(action->getState());
+    int num = coords->getNum() - this->startIndex.getValue();
+    if (num < 0) {
+        // Fixes: #0000545: Undo revolve causes crash 'illegal storage'
+        return;
+    }
     if (this->selectionIndex.getNum() > 0)
         renderSelection(action);
     if (this->highlightIndex.getValue() >= 0)