diff --git a/udftools-1.0.0b3-extsize.patch b/udftools-1.0.0b3-extsize.patch
new file mode 100644
index 0000000..6316f66
--- /dev/null
+++ b/udftools-1.0.0b3-extsize.patch
@@ -0,0 +1,21 @@
+diff -up udftools-1.0.0b3/libudffs/extent.c.extsize udftools-1.0.0b3/libudffs/extent.c
+--- udftools-1.0.0b3/libudffs/extent.c.extsize	2012-01-26 09:45:22.217856499 +0100
++++ udftools-1.0.0b3/libudffs/extent.c	2012-01-26 09:45:43.142855067 +0100
+@@ -50,7 +50,7 @@ cont:
+ 	while (start_ext != NULL && start_ext->blocks < blocks)
+ 		start_ext = next_extent(start_ext->next, type);
+ 
+-	if (start_ext->start % offset)
++	if (start_ext != NULL && start_ext->start % offset)
+ 	{
+ 		inc = offset - (start_ext->start % offset);
+ 		if (start_ext->blocks - inc < blocks)
+@@ -62,7 +62,7 @@ cont:
+ 	else
+ 		inc = 0;
+ 
+-	return start_ext->start + inc;
++	return start_ext ? start_ext->start + inc : NULL;
+ }
+ 
+ struct udf_extent *prev_extent(struct udf_extent *start_ext, enum udf_space_type type)
diff --git a/udftools.spec b/udftools.spec
index 63182bb..5edad91 100644
--- a/udftools.spec
+++ b/udftools.spec
@@ -1,7 +1,7 @@
 Summary: Linux UDF Filesystem userspace utilities
 Name: udftools
 Version: 1.0.0b3
-Release: 13%{?dist}
+Release: 14%{?dist}
 License: GPLv2+
 Group: Applications/Archiving
 URL: http://sourceforge.net/projects/linux-udf/
@@ -12,6 +12,7 @@ Patch2: udftools-1.0.0b3-wrudf-gcc4.patch
 Patch3: udftools-1.0.0b3-warningfixes.patch
 Patch4: udftools-1.0.0b3-fixcompile.patch
 Patch5: udftools-1.0.0b3-warningfixes2.patch
+Patch6: udftools-1.0.0b3-extsize.patch
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root
 BuildRequires: readline-devel, ncurses-devel
 
@@ -27,6 +28,7 @@ Linux UDF Filesystem userspace utilities.
 %patch3 -p1 -b .warningfixes
 %patch4 -p1 -b .fixcompile
 %patch5 -p1 -b .warningfixes2
+%patch6 -p1 -b .extsize
 
 
 %build
@@ -54,6 +56,10 @@ export CFLAGS="$RPM_OPT_FLAGS -fno-strict-aliasing"
 
 
 %changelog
+* Thu Jan 26 2012 Honza Horak <hhorak@redhat.com> - 1.0.0b3-14
+- fixed segmentation fault
+  Resolves: #685005
+
 * Mon Feb 07 2011 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.0.0b3-13
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_15_Mass_Rebuild