Don't crash on malformed documents that have links to unexistant places, for example in smli_tr-2005-143.pdf link [3] from page 4 does not point anywhere (Acrobat Reader confirms it)

BUGS: 104626

svn path=/trunk/kdegraphics/kpdf/; revision=408111

core/document.cpp

@@ -898,6 +898,7 @@ void KPDFDocument::processLink( const KPDFLink * link )
         case KPDFLink::Goto: {
             const KPDFLinkGoto * go = static_cast< const KPDFLinkGoto * >( link );
             d->nextDocumentViewport = go->destViewport();
+	    if (d->nextDocumentViewport.pageNumber == -1) return;
 
             // Explanation of why d->nextDocumentViewport is needed
             // all openRelativeFile does is launch a signal telling we

xpdf/xpdf/Catalog.cc

@@ -399,13 +399,20 @@ GBool NameTree::lookup(GString *name, Object *obj)
 {
   Entry *entry;
 
-  entry = *(Entry **) bsearch(name, entries,
+  Entry **e = (Entry **) bsearch(name, entries,
 			      length, sizeof(Entry *), Entry::cmp);
+  if (e) entry = *e;
+  else
+  {
+      error(-1, "failed to look up %s\n", name->getCString());
+      obj->initNull();
+      return gFalse;
+  }
   if (entry != NULL) {
     entry->value.fetch(xref, obj);
     return gTrue;
   } else {
-    printf("failed to look up %s\n", name->getCString());
+    error(-1, "failed to look up %s\n", name->getCString());
 
     obj->initNull();