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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/183398">183398</a></dd>
<dt>Author</dt> <dd>darin@apple.com</dd>
<dt>Date</dt> <dd>2015-04-27 10:07:20 -0700 (Mon, 27 Apr 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Crashes under IDBDatabase::closeConnection
https://bugs.webkit.org/show_bug.cgi?id=141745
Reviewed by Alexey Proskuryakov.
* Modules/indexeddb/IDBDatabase.cpp:
(WebCore::IDBDatabase::~IDBDatabase): Do the work of close/closeConnection without
actually calling those functions.
(WebCore::IDBDatabase::closeConnection): Protect the database so it's not destroyed
in the middle of this function's execution.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreModulesindexeddbIDBDatabasecpp">trunk/Source/WebCore/Modules/indexeddb/IDBDatabase.cpp</a></li>
</ul>
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<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (183397 => 183398)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2015-04-27 14:56:18 UTC (rev 183397)
+++ trunk/Source/WebCore/ChangeLog        2015-04-27 17:07:20 UTC (rev 183398)
</span><span class="lines">@@ -1,3 +1,16 @@
</span><ins>+2015-04-27 Darin Adler <darin@apple.com>
+
+ Crashes under IDBDatabase::closeConnection
+ https://bugs.webkit.org/show_bug.cgi?id=141745
+
+ Reviewed by Alexey Proskuryakov.
+
+ * Modules/indexeddb/IDBDatabase.cpp:
+ (WebCore::IDBDatabase::~IDBDatabase): Do the work of close/closeConnection without
+ actually calling those functions.
+ (WebCore::IDBDatabase::closeConnection): Protect the database so it's not destroyed
+ in the middle of this function's execution.
+
</ins><span class="cx"> 2015-04-27 Xabier Rodriguez Calvar <calvaris@igalia.com> and Youenn Fablet <youenn.fablet@crf.canon.fr>
</span><span class="cx">
</span><span class="cx"> [Streams API] ReadableStream constructor start function should be able to close the stream
</span></span></pre></div>
<a id="trunkSourceWebCoreModulesindexeddbIDBDatabasecpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/Modules/indexeddb/IDBDatabase.cpp (183397 => 183398)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/Modules/indexeddb/IDBDatabase.cpp        2015-04-27 14:56:18 UTC (rev 183397)
+++ trunk/Source/WebCore/Modules/indexeddb/IDBDatabase.cpp        2015-04-27 17:07:20 UTC (rev 183398)
</span><span class="lines">@@ -71,7 +71,26 @@
</span><span class="cx">
</span><span class="cx"> IDBDatabase::~IDBDatabase()
</span><span class="cx"> {
</span><del>- close();
</del><ins>+ // This does what IDBDatabase::close does, but without any ref/deref of the
+ // database since it is already in the process of being deleted. The logic here
+ // is also simpler since we know there are no transactions (since they ref the
+ // database when they are alive).
+
+ ASSERT(m_transactions.isEmpty());
+
+ if (!m_closePending) {
+ m_closePending = true;
+ m_backend->close(m_databaseCallbacks);
+ }
+
+ if (auto* context = scriptExecutionContext()) {
+ // Remove any pending versionchange events scheduled to fire on this
+ // connection. They would have been scheduled by the backend when another
+ // connection called setVersion, but the frontend connection is being
+ // closed before they could fire.
+ for (auto& event : m_enqueuedEvents)
+ context->eventQueue().cancelEvent(*event);
+ }
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> int64_t IDBDatabase::nextTransactionId()
</span><span class="lines">@@ -284,6 +303,10 @@
</span><span class="cx"> ASSERT(m_closePending);
</span><span class="cx"> ASSERT(m_transactions.isEmpty());
</span><span class="cx">
</span><ins>+ // Closing may result in deallocating the last transaction, which could result in deleting
+ // this IDBDatabase. We need the deallocation to happen after we are through.
+ Ref<IDBDatabase> protect(*this);
+
</ins><span class="cx"> m_backend->close(m_databaseCallbacks);
</span><span class="cx">
</span><span class="cx"> if (m_contextStopped || !scriptExecutionContext())
</span></span></pre>
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