From 96fdca6f544d2086972361df332edc543ba5fab0 Mon Sep 17 00:00:00 2001
From: Justin Viiret <justin.viiret@intel.com>
Date: Tue, 7 Mar 2017 09:41:51 +1100
Subject: [PATCH] rose: guard writeNfaInfo from zero NFAs

---
 src/rose/rose_build_bytecode.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/rose/rose_build_bytecode.cpp b/src/rose/rose_build_bytecode.cpp
index 4b35e9e5..bce26a10 100644
--- a/src/rose/rose_build_bytecode.cpp
+++ b/src/rose/rose_build_bytecode.cpp
@@ -2695,9 +2695,13 @@ void writeLeftInfo(build_context &bc, RoseEngine &proto,
 static
 void writeNfaInfo(const RoseBuildImpl &build, build_context &bc,
                   RoseEngine &proto, const set<u32> &no_retrigger_queues) {
+    const u32 queue_count = build.qif.allocated_count();
+    if (!queue_count) {
+        return;
+    }
+
     auto ekey_lists = buildSuffixEkeyLists(build, bc, build.qif);
 
-    const u32 queue_count = build.qif.allocated_count();
     vector<NfaInfo> infos(queue_count);
     memset(infos.data(), 0, sizeof(NfaInfo) * queue_count);