diff --git a/exiv2-0.21.1-tiffcomposite.patch b/exiv2-0.21.1-tiffcomposite.patch
new file mode 100644
index 0000000..0f4e469
--- /dev/null
+++ b/exiv2-0.21.1-tiffcomposite.patch
@@ -0,0 +1,26 @@
+Index: tiffcomposite.cpp
+===================================================================
+--- tiffcomposite.cpp	(revision 2561)
++++ tiffcomposite.cpp	(revision 2562)
+@@ -1689,11 +1689,19 @@
+ 
+         if (elements_.empty()) return 0;
+ 
++        // Remaining assumptions:
++        // - array elements don't "overlap"
++        // - no duplicate tags in the array
+         uint32_t idx = 0;
++        uint32_t sz = cfg()->tagStep();
+         for (Components::const_iterator i = elements_.begin(); i != elements_.end(); ++i) {
+-            idx = EXV_MAX(idx, (*i)->tag() * cfg()->tagStep());
+-            idx += (*i)->size();
++            if ((*i)->tag() > idx) {
++                idx = (*i)->tag();
++                sz = (*i)->size();
++            }
+         }
++        idx = idx * cfg()->tagStep() + sz;
++
+         if (cfg()->hasFillers_ && def()) {
+             const ArrayDef* lastDef = def() + defSize() - 1;
+             uint16_t lastTag = static_cast<uint16_t>(lastDef->idx_ / cfg()->tagStep());
diff --git a/exiv2.spec b/exiv2.spec
index ead19b3..b7bf072 100644
--- a/exiv2.spec
+++ b/exiv2.spec
@@ -2,7 +2,7 @@
 Summary: Exif and Iptc metadata manipulation library
 Name:	 exiv2
 Version: 0.21.1
-Release: 1%{?dist}
+Release: 2%{?dist}
 
 License: GPLv2+
 Group:	 Applications/Multimedia
@@ -10,6 +10,10 @@ URL: 	 http://www.exiv2.org/
 Source0: http://www.exiv2.org/exiv2-%{version}%{?pre:-%{pre}}.tar.gz
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
+## upstream patches
+# http://dev.exiv2.org/issues/769
+Patch100: exiv2-0.21.1-tiffcomposite.patch
+
 BuildRequires: chrpath
 BuildRequires: expat-devel
 BuildRequires: gettext
@@ -53,6 +57,10 @@ methods for Exif thumbnails, classes to access Ifd and so on.
 %prep
 %setup -q -n %{name}-%{version}%{?pre:-%{pre}}
 
+pushd src
+%patch100 -p0 -b .tiffcomposite
+popd
+
 mkdir doc/html
 
 
@@ -116,6 +124,9 @@ rm -rf %{buildroot}
 
 
 %changelog
+* Mon Sep 26 2011 Rex Dieter <rdieter@fedoraproject.org> 0.21.1-2
+- gthumb crashes because of bug in exiv2 0.21.1 (#741429)
+
 * Sat Feb 26 2011 Rex Dieter <rdieter@fedoraproject.org> 0.21.1-1
 - exiv2-0.21.1