From d73a4090c8c5e36ae0d9a3eb5cf5dd3e230befa8 Mon Sep 17 00:00:00 2001
From: Alexey Sokolov <alexey+znc@asokolov.org>
Date: Tue, 3 Oct 2017 08:03:37 +0100
Subject: [PATCH] Fix crash caused by an unsigned overflow.

Thanks to Joseph Bisch for discovery.
This was an artifact of converting ZNC to use CMessage. Released
versions are not affected.
---
 src/IRCSock.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/IRCSock.cpp b/src/IRCSock.cpp
index a0c5a07f..3e27e1f0 100644
--- a/src/IRCSock.cpp
+++ b/src/IRCSock.cpp
@@ -1320,7 +1320,7 @@ void CIRCSock::ReachedMaxBuffer() {
 void CIRCSock::ParseISupport(const CMessage& Message) {
     const VCString vsParams = Message.GetParams();
 
-    for (size_t i = 1; i < vsParams.size() - 1; ++i) {
+    for (size_t i = 1; i + 1 < vsParams.size(); ++i) {
         const CString& sParam = vsParams[i];
         CString sName = sParam.Token(0, false, "=");
         CString sValue = sParam.Token(1, true, "=");