Merge #26457: [24.x] backport rpc: skip getpeerinfo for a peer withou…

…t CNodeStateStats

e72313e rpc: Require NodeStateStats object in getpeerinfo (Martin Zumsande)

Pull request description:

  Backports #26515.

ACKs for top commit:
  fanquake:
    ACK e72313e

Tree-SHA512: 28e885ea299fe8a3a7538628d413c434bc42c251a2c1ae238bca0652709f5bd781eb157675171ab538f6e2f6f720f1c184200ac3857f6c78f48858949eed49da

src/rpc/net.cpp

@@ -185,6 +185,14 @@ static RPCHelpMan getpeerinfo()
         UniValue obj(UniValue::VOBJ);
         CNodeStateStats statestats;
         bool fStateStats = peerman.GetNodeStateStats(stats.nodeid, statestats);
+        // GetNodeStateStats() requires the existence of a CNodeState and a Peer object
+        // to succeed for this peer. These are created at connection initialisation and
+        // exist for the duration of the connection - except if there is a race where the
+        // peer got disconnected in between the GetNodeStats() and the GetNodeStateStats()
+        // calls. In this case, the peer doesn't need to be reported here.
+        if (!fStateStats) {
+            continue;
+        }
         obj.pushKV("id", stats.nodeid);
         obj.pushKV("addr", stats.m_addr_name);
         if (stats.addrBind.IsValid()) {