Name: CAN-2005-2096 (under review)
Description:
  Buffer overflow in zlib 1.2 and later versions allows remote attackers 
  to cause a denial of service (crash) via a crafted compressed stream, as 
  demonstrated using a crafted PNG file.
  
References:
  * DEBIAN:DSA-740
    http://www.debian.org/security/2005/dsa-740
  * REDHAT:RHSA-2005:569
    http://www.redhat.com/support/errata/RHSA-2005-569.html 

  http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2096

diff -ruN zlib-1.2.2-old/inftrees.c zlib-1.2.2-new/inftrees.c
--- zlib-1.2.2-old/inftrees.c	2004-09-15 16:30:06.000000000 +0200
+++ zlib-1.2.2-new/inftrees.c	2005-07-08 21:18:58.000000000 +0200
@@ -134,7 +134,7 @@
         left -= count[len];
         if (left < 0) return -1;        /* over-subscribed */
     }
-    if (left > 0 && (type == CODES || (codes - count[0] != 1)))
+    if (left > 0 && (type == CODES || max != 1))
         return -1;                      /* incomplete set */
 
     /* generate offsets into symbol table for each length for sorting */