Fontdata gets corrupted with poor /broken network connection resulting in crash while loading a webpage.

--- a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
@@ -215,7 +215,7 @@ namespace {
         TableDirectory *nameTableDirectoryEntry = tableDirectoryEntry("name");
         if (nameTableDirectoryEntry == 0)
             return QString();
-
+		qDebug()<<"Changing "<< newFamilyName << m_fontData.size();
         QString oldFamilyName = familyName(nameTableDirectoryEntry);

--- a/Source/WebCore/platform/graphics/qt/FontCustomPlatformDataQt.cpp
+++ b/Source/WebCore/platform/graphics/qt/FontCustomPlatformDataQt.cpp
@@ -28,6 +28,7 @@
 #include "WOFFFileFormat.h"
 #endif
 #include <QStringList>
+#include <QDebug>
 
 namespace WebCore {
 
@@ -55,6 +56,9 @@ FontCustomPlatformData* createFontCustomPlatformData(SharedBuffer* buffer)
 #endif // USE(ZLIB)
 
     const QByteArray fontData(buffer->data(), buffer->size());
+    if(fontData.isNull() || !fontData.endsWith("\0"))
+		return 0;
+    qDebug()<<"Font Data Size : "<<fontData.size();
 #if !USE(ZLIB)
     if (fontData.startsWith("wOFF")) {
         qWarning("WOFF support requires QtWebKit to be built with zlib support.");