don't dereference unset xsane.preview (#693224)

xsane-0.998-xsane_update_param-crash.patch

@@ -0,0 +1,32 @@
+From 173a9a51f4d79a9d76987a9e425a64038c887b3e Mon Sep 17 00:00:00 2001
+From: Nils Philippsen <nils@redhat.com>
+Date: Mon, 4 Apr 2011 11:16:16 +0200
+Subject: [PATCH] patch: xsane_update_param-crash
+
+Squashed commit of the following:
+
+commit 4b2f69d1b51db7160a33764a4f68ab3c4fc43678
+Author: Nils Philippsen <nils@redhat.com>
+Date:   Mon Apr 4 11:13:20 2011 +0200
+
+    don't dereference xsane.preview if it is NULL
+---
+ src/xsane-front-gtk.c |    2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/src/xsane-front-gtk.c b/src/xsane-front-gtk.c
+index 08761a0..66a3177 100644
+--- a/src/xsane-front-gtk.c
++++ b/src/xsane-front-gtk.c
+@@ -1713,7 +1713,7 @@ void xsane_update_param(void *arg)
+   gtk_label_set(GTK_LABEL(xsane.info_label), buf);
+ 
+ 
+-  if (xsane.preview->surface_unit == SANE_UNIT_MM)
++  if (xsane.preview && xsane.preview->surface_unit == SANE_UNIT_MM)
+   {
+    double dx, dy;
+ 
+-- 
+1.7.4.2
+

xsane.spec

@@ -34,6 +34,9 @@ Patch4: xsane-0.997-no-file-selected.patch
 Patch5: xsane-0.997-ipv6.patch
 # distro-specific: customize desktop file
 Patch6: xsane-0.998-desktop-file.patch
+# https://bugzilla.redhat.com/show_bug.cgi?id=693224
+# submitted to upstream (Oliver Rauch) via email, 2011-04-04
+Patch7: xsane-0.998-xsane_update_param-crash.patch
 # autoconf-generated files
 Patch100: xsane-0.998-1-autoconf.patch.bz2
 License: GPLv2+
@@ -91,6 +94,7 @@ done
 %patch4 -p1 -b .no-file-selected
 %patch5 -p1 -b .ipv6
 %patch6 -p1 -b .desktop-file
+%patch7 -p1 -b .xsane_update_param-crash
 
 %patch100 -p1 -b .autoconf
 
@@ -161,6 +165,9 @@ fi
 %{_datadir}/sane/xsane
 
 %changelog
+* Mon Apr 04 2011 Nils Philippsen <nils@redhat.com> - 0.998-3
+- don't dereference unset xsane.preview (#693224)
+
 * Tue Feb 08 2011 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 0.998-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_15_Mass_Rebuild