From 90fc018295e555b7df53fef041db38495dbc7e7b Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Wed, 18 Jan 2017 09:30:04 -0800
Subject: [PATCH] Avoid sigsegv after "patchelf --set-rpath"

https://github.com/upx/upx/issues/47
Enhancement not yet implemented: non-adjacent ElfXX_Ehdr and ElfXX_Phdr.
	modified:   p_unix.cpp
---
 src/p_unix.cpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/p_unix.cpp b/src/p_unix.cpp
index 456e29c3..695c79b7 100644
--- a/src/p_unix.cpp
+++ b/src/p_unix.cpp
@@ -4,6 +4,7 @@
 
    Copyright (C) 1996-2017 Markus Franz Xaver Johannes Oberhumer
    Copyright (C) 1996-2017 Laszlo Molnar
+   Copyright (C) 2000-2017 John F. Reiser
    All Rights Reserved.
 
    UPX and the UCL library are free software; you can redistribute them
@@ -23,6 +24,9 @@
 
    Markus F.X.J. Oberhumer              Laszlo Molnar
    <markus@oberhumer.com>               <ezerotven+github@gmail.com>
+
+   John F. Reiser
+   <jreiser@users.sourceforge.net>
  */
 
 
@@ -242,8 +246,14 @@ PackUnix::patchLoaderChecksum()
     set_te32(&lp->l_checksum, upx_adler32(ptr, lsize));
 }
 
-void PackUnix::pack3(OutputFile *fo, Filter &/*ft*/)
+void PackUnix::pack3(OutputFile *fo, Filter &ft)
 {
+    if (0==linker) {
+        // If no filter, then linker is not constructed by side effect
+        // of packExtent calling compressWithFilters.
+        // This is typical after "/usr/bin/patchelf --set-rpath".
+        buildLoader(&ft);
+    }
     upx_byte *p = getLoader();
     lsize = getLoaderSize();
     updateLoader(fo);