From f7771a426fcd7d18b88f18454b08a88cdab515b6 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Fri, 30 Dec 2016 13:48:31 -0800
Subject: You have to do the bounds check before the access.

---
 apt-pkg/tagfile.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 250f7ac17..14f89f797 100644
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -390,7 +390,7 @@ bool pkgTagSection::FindInternal(unsigned int Pos, const char *&Start,
    if (unlikely(Start > End))
       return _error->Error("Internal parsing error");
 
-   for (; isspace_ascii(End[-1]) != 0 && End > Start; --End);
+   for (; End > Start && isspace_ascii(End[-1]) != 0; --End);
 
    return true;
 }
-- 
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