From: Justin Viiret <justin.viiret@intel.com>
Date: Mon, 6 Mar 2017 22:41:51 +0000 (+1100)
Subject: rose: guard writeNfaInfo from zero NFAs
X-Git-Tag: v4.5.0^2~194
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=96fdca6f544d2086972361df332edc543ba5fab0;p=thirdparty%2Fvectorscan.git

rose: guard writeNfaInfo from zero NFAs
---

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);