From aefb2fa3c3c9be723076d3fd49c5a4f69121f715 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Tue, 19 Dec 2017 17:36:22 -0800
Subject: [PATCH] bad logic for throwCantUnpack("cmdsize") [simple]

https://github.com/upx/upx/issues/161
	modified:   p_mach.cpp
---
 src/p_mach.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/p_mach.cpp b/src/p_mach.cpp
index ce297ca5..f9a3829a 100644
--- a/src/p_mach.cpp
+++ b/src/p_mach.cpp
@@ -1563,7 +1563,7 @@ void PackMachBase<T>::unpack(OutputFile *fo)
         memcpy(&msegcmd[j], ptr, umin(sizeof(Mach_segment_command),
             ((Mach_command const *)ptr)->cmdsize));
         ptr += (unsigned) ((Mach_command const *)ptr)->cmdsize;
-        if (ptr_udiff(ptr, mhdr) > ph.u_len) {
+        if (ptr_udiff(ptr, (1+ mhdr)) > ph.u_len) {
             throwCantUnpack("cmdsize");
         }
     }