From 148c870048152023d152c4464f4a52c8bcb9ccaf Mon Sep 17 00:00:00 2001
From: Josh Andler <scislac@gmail.com>
Date: Sat, 9 Jan 2010 12:05:26 -0800
Subject: [PATCH] Patch by Alex Leone to fix crash with recursive masks from
 190130, I also added him to AUTHORS

---
 AUTHORS       |  1 +
 src/sp-mask.h | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/AUTHORS b/AUTHORS
index 7abce1c56..7e042f9f8 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -80,6 +80,7 @@ Adrian Knoth
 Krzysztof Kosiński
 Petr Kovar
 Benoît Lavorata
+Alex Leone
 Julien Leray
 Raph Levien
 Diederik van Lierop
diff --git a/src/sp-mask.h b/src/sp-mask.h
index d5bddd332..0b995f0ce 100644
--- a/src/sp-mask.h
+++ b/src/sp-mask.h
@@ -26,6 +26,7 @@ class SPMaskView;
 #include "libnr/nr-forward.h"
 #include "sp-object-group.h"
 #include "uri-references.h"
+#include "xml/node.h"
 
 struct SPMask : public SPObjectGroup {
 	unsigned int maskUnits_set : 1;
@@ -50,8 +51,39 @@ public:
 		return (SPMask *)URIReference::getObject();
 	}
 protected:
+    /**
+     * If the owner element of this reference (the element with <... mask="...">)
+     * is a child of the mask it refers to, return false.
+     * \return false if obj is not a mask or if obj is a parent of this
+     *         reference's owner element.  True otherwise.
+     */
 	virtual bool _acceptObject(SPObject *obj) const {
-		return SP_IS_MASK(obj);
+		if (!SP_IS_MASK(obj)) {
+		    return false;
+	    }
+	    SPObject * const owner = this->getOwner();
+        if (obj->isAncestorOf(owner)) {
+            Inkscape::XML::Node * const owner_repr = owner->repr;
+            Inkscape::XML::Node * const obj_repr = obj->repr;
+            gchar const * owner_name = NULL;
+            gchar const * owner_mask = NULL;
+            gchar const * obj_name = NULL;
+            gchar const * obj_id = NULL;
+            if (owner_repr != NULL) {
+                owner_name = owner_repr->name();
+                owner_mask = owner_repr->attribute("mask");
+            }
+            if (obj_repr != NULL) {
+                obj_name = obj_repr->name();
+                obj_id = obj_repr->attribute("id");
+            }
+            g_warning("Ignoring recursive mask reference "
+                      "<%s mask=\"%s\"> in <%s id=\"%s\">",
+                      owner_name, owner_mask,
+                      obj_name, obj_id);
+            return false;
+        }
+        return true;
 	}
 };
 
-- 
2.30.2