diff -uprk.orig zlib-1.2.1.1.orig/infback.c zlib-1.2.1.1/infback.c
--- zlib-1.2.1.1.orig/infback.c	2003-08-12 03:48:06 +0400
+++ zlib-1.2.1.1/infback.c	2004-08-24 18:45:17 +0400
@@ -434,6 +434,9 @@ int ZEXPORT inflateBack(strm, in, in_desc, out, out_desc)
                 }
             }
 
+            if (state->mode == BAD)
+                break;
+
             /* build code tables */
             state->next = state->codes;
             state->lencode = (code const FAR *)(state->next);
diff -uprk.orig zlib-1.2.1.1.orig/inflate.c zlib-1.2.1.1/inflate.c
--- zlib-1.2.1.1.orig/inflate.c	2003-10-26 09:15:36 +0300
+++ zlib-1.2.1.1/inflate.c	2004-08-24 18:40:39 +0400
@@ -861,6 +861,9 @@ int ZEXPORT inflate(strm, flush)
                 }
             }
 
+            if (state->mode == BAD)
+                break;
+
             /* build code tables */
             state->next = state->codes;
             state->lencode = (code const FAR *)(state->next);