graphite2-1.3.8-rule-length-test-overflow-fix.patch

From 56157cf9845d13452068c297205f96b946126cc2 Mon Sep 17 00:00:00 2001
From: Martin Hosken <martin_hosken@sil.org>
Date: Mon, 4 Apr 2016 16:04:16 +0700
Subject: [PATCH] Resolve rule length test overflow

---
 src/Pass.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Pass.cpp b/src/Pass.cpp
index 7289406..1c9c73c 100644
--- a/src/Pass.cpp
+++ b/src/Pass.cpp
@@ -635,7 +635,7 @@ bool Pass::testPassConstraint(Machine & m) const
 bool Pass::testConstraint(const Rule & r, Machine & m) const
 {
     const uint16 curr_context = m.slotMap().context();
-    if (unsigned(r.sort - r.preContext) > m.slotMap().size() - curr_context
+    if (unsigned(r.sort + curr_context - r.preContext) > m.slotMap().size()
         || curr_context - r.preContext < 0) return false;
 
     vm::slotref * map = m.slotMap().begin() + curr_context - r.preContext;