diff --git a/glibc-rh767696.patch b/glibc-rh767696.patch
new file mode 100644
index 0000000..0536efa
--- /dev/null
+++ b/glibc-rh767696.patch
@@ -0,0 +1,82 @@
+commit 97ac2654b2d831acaa18a2b018b0736245903fd2
+Author: Ulrich Drepper <drepper@gmail.com>
+Date:   Sat Dec 17 20:18:42 2011 -0500
+
+    Check values from TZ file header
+
+
+	[BZ #13506]
+	* time/tzfile.c (__tzfile_read): Check values from file header.
+
+diff --git a/time/tzfile.c b/time/tzfile.c
+index 144e20b..402389c 100644
+--- a/time/tzfile.c
++++ b/time/tzfile.c
+@@ -234,23 +234,58 @@ __tzfile_read (const char *file, size_t extra, char **extrap)
+       goto read_again;
+     }
+ 
++  if (__builtin_expect (num_transitions
++			> ((SIZE_MAX - (__alignof__ (struct ttinfo) - 1))
++			   / (sizeof (time_t) + 1)), 0))
++    goto lose;
+   total_size = num_transitions * (sizeof (time_t) + 1);
+   total_size = ((total_size + __alignof__ (struct ttinfo) - 1)
+ 		& ~(__alignof__ (struct ttinfo) - 1));
+   types_idx = total_size;
+-  total_size += num_types * sizeof (struct ttinfo) + chars;
++  if (__builtin_expect (num_types
++			> (SIZE_MAX - total_size) / sizeof (struct ttinfo), 0))
++    goto lose;
++  total_size += num_types * sizeof (struct ttinfo);
++  if (__builtin_expect (chars > SIZE_MAX - total_size, 0))
++    goto lose;
++  total_size += chars;
++  if (__builtin_expect (__alignof__ (struct leap) - 1
++			> SIZE_MAX - total_size, 0))
++    goto lose;
+   total_size = ((total_size + __alignof__ (struct leap) - 1)
+ 		& ~(__alignof__ (struct leap) - 1));
+   leaps_idx = total_size;
++  if (__builtin_expect (num_leaps
++			> (SIZE_MAX - total_size) / sizeof (struct leap), 0))
++    goto lose;
+   total_size += num_leaps * sizeof (struct leap);
+-  tzspec_len = (sizeof (time_t) == 8 && trans_width == 8
+-		? st.st_size - (ftello (f)
+-				+ num_transitions * (8 + 1)
+-				+ num_types * 6
+-				+ chars
+-				+ num_leaps * 12
+-				+ num_isstd
+-				+ num_isgmt) - 1 : 0);
++  tzspec_len = 0;
++  if (sizeof (time_t) == 8 && trans_width == 8)
++    {
++      off_t rem = st.st_size - ftello (f);
++      if (__builtin_expect (rem < 0
++			    || (size_t) rem < (num_transitions * (8 + 1)
++					       + num_types * 6
++					       + chars), 0))
++	goto lose;
++      tzspec_len = (size_t) rem - (num_transitions * (8 + 1)
++				   + num_types * 6
++				   + chars);
++      if (__builtin_expect (num_leaps > SIZE_MAX / 12
++			    || tzspec_len < num_leaps * 12, 0))
++	goto lose;
++      tzspec_len -= num_leaps * 12;
++      if (__builtin_expect (tzspec_len < num_isstd, 0))
++	goto lose;
++      tzspec_len -= num_isstd;
++      if (__builtin_expect (tzspec == 0 || tzspec_len - 1 < num_isgmt, 0))
++	goto lose;
++      tzspec_len -= num_isgmt + 1;
++      if (__builtin_expect (SIZE_MAX - total_size < tzspec_len, 0))
++	goto lose;
++    }
++  if (__builtin_expect (SIZE_MAX - total_size - tzspec_len < extra, 0))
++    goto lose;
+ 
+   /* Allocate enough memory including the extra block requested by the
+      caller.  */
diff --git a/glibc.spec b/glibc.spec
index 69efe6e..4d6d460 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -24,7 +24,7 @@
 Summary: The GNU libc libraries
 Name: glibc
 Version: %{glibcversion}
-Release: 2
+Release: 3
 # GPLv2+ is used in a bunch of programs, LGPLv2+ is used for libraries.
 # Things that are linked directly into dynamically linked programs
 # and shared libraries (e.g. crt files, lib*_nonshared.a) have an additional
@@ -38,6 +38,8 @@ Source1: %{?glibc_release_url}%{glibcportsdir}.tar.xz
 Source2: %{glibcsrcdir}-fedora.tar.xz
 Patch0: %{name}-fedora.patch
 Patch1: %{name}-ia64-lib64.patch
+Patch2: %{name}-rh767696.patch
+
 Buildroot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 Obsoletes: glibc-profile < 2.4
 Provides: ldconfig
@@ -250,6 +252,7 @@ rm -rf %{glibcportsdir}
 %patch1 -p1
 %endif
 %endif
+%patch2 -p1
 
 # A lot of programs still misuse memcpy when they have to use
 # memmove. The memcpy implementation below is not tolerant at
@@ -1032,6 +1035,10 @@ rm -f *.filelist*
 %endif
 
 %changelog
+* Sun Dec 19 2011 Jeff Law <law@redhat.com> - 2.13-3
+  - Check values from TZ file header (#767696)
+
+
 * Thu Aug  4 2011 Andreas Schwab <schwab@redhat.com> - 2.13-2
 - Update from 2.13 branch
   - Fix static linking with checking x86/x86-64 memcpy (BZ#12653)