From f0aef9b28bffd92b697748b8b82ed927f0c0b8a0 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Fri, 8 May 2015 17:04:16 -0700
Subject: [PATCH] Check input data; CERT-FI upx-crashes-elf
 id:000000,sig:11,src:000000,op:flip1,pos:0

---
 src/filter/ctojr.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/filter/ctojr.h b/src/filter/ctojr.h
index 4c74ea4b..1d27c3f1 100644
--- a/src/filter/ctojr.h
+++ b/src/filter/ctojr.h
@@ -300,6 +300,9 @@ static int U(Filter *f)
                         }
                         else { // not 1st time at this destination
                             jc >>= 1;
+                            if (N_MRU <= jc) {
+                                throwCompressedDataViolation();
+                            }
                             int kh = jc + hand;
                             if (N_MRU <= kh) {
                                 kh -= N_MRU;