[evince] libview: Check number of pages on ev_view_document_changed_cb

[Germán Poó Caamaño <gpoo src gnome org>]

commit 6230a6fae0c84696e2e52e7a1d720edfd54dd38d
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Thu May 30 18:05:36 2013 -0700

    libview: Check number of pages on ev_view_document_changed_cb
    
    Fix crash on corrupted PDF with no pages.
    
    Thanks to Juha Kylmänen from OUSPG who were testing robutness.
    (CVE-2013-3718).
    
    https://bugzilla.gnome.org/show_bug.cgi?id=701302

 libview/ev-view.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/libview/ev-view.c b/libview/ev-view.c
index 3a6bde3..706301f 100644
--- a/libview/ev-view.c
+++ b/libview/ev-view.c
@@ -5350,6 +5350,10 @@ ev_view_document_changed_cb (EvDocumentModel *model,
 {
        EvDocument *document = ev_document_model_get_document (model);
 
+       if (ev_document_get_n_pages (document) <= 0 ||
+           !ev_document_check_dimensions (document))
+               return;
+
        if (document != view->document) {
                gint current_page;