Ensure cs_vNodes is held when using the return value from FindNode

Author: TheBlueMatt

src/net.cpp

@@ -369,15 +369,13 @@ CNode* CConnman::ConnectNode(CAddress addrConnect, const char *pszDest, bool fCo
             // In that case, drop the connection that was just created, and return the existing CNode instead.
             // Also store the name we used to connect in that CNode, so that future FindNode() calls to that
             // name catch this early.
+            LOCK(cs_vNodes);
             CNode* pnode = FindNode((CService)addrConnect);
             if (pnode)
             {
                 pnode->AddRef();
-                {
-                    LOCK(cs_vNodes);
-                    if (pnode->addrName.empty()) {
-                        pnode->addrName = std::string(pszDest);
-                    }
+                if (pnode->addrName.empty()) {
+                    pnode->addrName = std::string(pszDest);
                 }
                 CloseSocket(hSocket);
                 return pnode;
@@ -2373,6 +2371,7 @@ void CConnman::GetNodeStats(std::vector<CNodeStats>& vstats)
 
 bool CConnman::DisconnectNode(const std::string& strNode)
 {
+    LOCK(cs_vNodes);
     if (CNode* pnode = FindNode(strNode)) {
         pnode->fDisconnect = true;
         return true;