commit 5cffc05ed5c7fea312f2822d388afc025d03c08a
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Apr 27 09:57:51 2015 -0700

    Check tzspec_len == 0 in __tzfile_read
    
    	[BZ#18333]
    	* time/tzset.c (__tzfile_read): Check tzspec_len == 0.

--- a/time/tzfile.c
+++ b/time/tzfile.c
@@ -283,7 +283,8 @@
       if (__builtin_expect (tzspec_len == 0 || tzspec_len - 1 < num_isgmt, 0))
 	goto lose;
       tzspec_len -= num_isgmt + 1;
-      if (__builtin_expect (SIZE_MAX - total_size < tzspec_len, 0))
+      if (__builtin_expect (tzspec_len == 0
+                            || SIZE_MAX - total_size < tzspec_len, 0))
 	goto lose;
     }
   if (__builtin_expect (SIZE_MAX - total_size - tzspec_len < extra, 0))