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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/182543">182543</a></dd>
<dt>Author</dt> <dd>carlosgc@webkit.org</dd>
<dt>Date</dt> <dd>2015-04-08 09:31:01 -0700 (Wed, 08 Apr 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Merge <a href="http://trac.webkit.org/projects/webkit/changeset/182537">r182537</a> - [GTK] Crash in DOMObjectCache when a wrapped object owned by the cache is unreffed by the user
https://bugs.webkit.org/show_bug.cgi?id=143521
Reviewed by Martin Robinson.
This is a case we claim to support, but it only works if the
object has only one reference. In that case, when the user unrefs
it, the weak ref notify callback removes the object from the
cache. However, if the object has more than one ref, the cache
doesn't know the user unreffed it, and when clearing the cache we
try to remove more references than what the object actually has,
causing a crash in g_object_unref.
* bindings/gobject/DOMObjectCache.cpp:
(WebKit::DOMObjectCacheData::clearObject):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#releasesWebKitGTKwebkit24SourceWebCoreChangeLog">releases/WebKitGTK/webkit-2.4/Source/WebCore/ChangeLog</a></li>
<li><a href="#releasesWebKitGTKwebkit24SourceWebCorebindingsgobjectDOMObjectCachecpp">releases/WebKitGTK/webkit-2.4/Source/WebCore/bindings/gobject/DOMObjectCache.cpp</a></li>
<li><a href="#releasesWebKitGTKwebkit24ToolsTestWebKitAPITestsWebKitGtktestdomdocumentc">releases/WebKitGTK/webkit-2.4/Tools/TestWebKitAPI/Tests/WebKitGtk/testdomdocument.c</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="releasesWebKitGTKwebkit24SourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.4/Source/WebCore/ChangeLog (182542 => 182543)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.4/Source/WebCore/ChangeLog 2015-04-08 16:25:54 UTC (rev 182542)
+++ releases/WebKitGTK/webkit-2.4/Source/WebCore/ChangeLog 2015-04-08 16:31:01 UTC (rev 182543)
</span><span class="lines">@@ -1,3 +1,21 @@
</span><ins>+2015-04-08 Carlos Garcia Campos <cgarcia@igalia.com>
+
+ [GTK] Crash in DOMObjectCache when a wrapped object owned by the cache is unreffed by the user
+ https://bugs.webkit.org/show_bug.cgi?id=143521
+
+ Reviewed by Martin Robinson.
+
+ This is a case we claim to support, but it only works if the
+ object has only one reference. In that case, when the user unrefs
+ it, the weak ref notify callback removes the object from the
+ cache. However, if the object has more than one ref, the cache
+ doesn't know the user unreffed it, and when clearing the cache we
+ try to remove more references than what the object actually has,
+ causing a crash in g_object_unref.
+
+ * bindings/gobject/DOMObjectCache.cpp:
+ (WebKit::DOMObjectCacheData::clearObject):
+
</ins><span class="cx"> 2015-02-17 Carlos Garcia Campos <cgarcia@igalia.com>
</span><span class="cx">
</span><span class="cx"> Use HashMap::add instead of get/contains + set in DOMObjectCache
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit24SourceWebCorebindingsgobjectDOMObjectCachecpp"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.4/Source/WebCore/bindings/gobject/DOMObjectCache.cpp (182542 => 182543)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.4/Source/WebCore/bindings/gobject/DOMObjectCache.cpp 2015-04-08 16:25:54 UTC (rev 182542)
+++ releases/WebKitGTK/webkit-2.4/Source/WebCore/bindings/gobject/DOMObjectCache.cpp 2015-04-08 16:31:01 UTC (rev 182543)
</span><span class="lines">@@ -43,7 +43,11 @@
</span><span class="cx"> {
</span><span class="cx"> ASSERT(object);
</span><span class="cx"> ASSERT(cacheReferences >= 1);
</span><ins>+ ASSERT(object->ref_count >= 1);
</ins><span class="cx">
</span><ins>+ // Make sure we don't unref more than the references the object actually has. It can happen that user
+ // unreffed a reference owned by the cache.
+ cacheReferences = std::min(static_cast<unsigned>(object->ref_count), cacheReferences);
</ins><span class="cx"> GRefPtr<GObject> protect(object);
</span><span class="cx"> do {
</span><span class="cx"> g_object_unref(object);
</span></span></pre></div>
<a id="releasesWebKitGTKwebkit24ToolsTestWebKitAPITestsWebKitGtktestdomdocumentc"></a>
<div class="modfile"><h4>Modified: releases/WebKitGTK/webkit-2.4/Tools/TestWebKitAPI/Tests/WebKitGtk/testdomdocument.c (182542 => 182543)</h4>
<pre class="diff"><span>
<span class="info">--- releases/WebKitGTK/webkit-2.4/Tools/TestWebKitAPI/Tests/WebKitGtk/testdomdocument.c 2015-04-08 16:25:54 UTC (rev 182542)
+++ releases/WebKitGTK/webkit-2.4/Tools/TestWebKitAPI/Tests/WebKitGtk/testdomdocument.c 2015-04-08 16:31:01 UTC (rev 182543)
</span><span class="lines">@@ -309,6 +309,23 @@
</span><span class="cx"> count = 0;
</span><span class="cx">
</span><span class="cx"> document = webkit_web_view_get_dom_document(view);
</span><ins>+ body = webkit_dom_document_get_body(document);
+ WebKitDOMElement* p = webkit_dom_document_create_element(document, "P", NULL);
+ webkit_dom_node_append_child(WEBKIT_DOM_NODE(body), WEBKIT_DOM_NODE(p), NULL);
+ g_object_weak_ref(G_OBJECT(p), (GWeakNotify)weak_notify, &count);
+ /* This is wrong, p is transfer none and owned by the cache, but we shouldn't crash in that case. */
+ g_object_unref(p);
+
+ webkit_web_view_load_string(WEBKIT_WEB_VIEW(view), HTML_DOCUMENT_IFRAME, NULL, NULL, NULL);
+
+ while (g_main_context_pending(NULL))
+ g_main_context_iteration(NULL, FALSE);
+
+ g_assert_cmpuint(count, ==, 1);
+
+ count = 0;
+
+ document = webkit_web_view_get_dom_document(view);
</ins><span class="cx"> WebKitDOMElement* div = webkit_dom_document_get_element_by_id(document, "test");
</span><span class="cx"> g_assert(div);
</span><span class="cx"> g_object_weak_ref(G_OBJECT(div), (GWeakNotify)weak_notify, &count);
</span></span></pre>
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