From 4ff9a830a501e255f67ff912b5213796550fcc94 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Mon, 30 Jan 2017 09:13:46 -0800
Subject: The length given to msync was calculated wrong :/.

---
 apt-pkg/contrib/mmap.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/apt-pkg/contrib/mmap.cc b/apt-pkg/contrib/mmap.cc
index d85a7f169..10786f23f 100644
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -200,7 +200,8 @@ bool MMap::Sync(unsigned long Start,unsigned long Stop)
       {
 #ifdef _POSIX_SYNCHRONIZED_IO
 	 unsigned long long const PSize = sysconf(_SC_PAGESIZE);
-	 if (msync((char *)Base+(Start/PSize)*PSize, Stop - Start, MS_SYNC) < 0)
+         Start = (Start/PSize)*PSize;
+	 if (msync((char *)Base+Start, Stop - Start, MS_SYNC) < 0)
 	    return _error->Errno("msync", _("Unable to synchronize mmap"));
 #endif
       }
-- 
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