From d09e7a296d3a16589dd3dea89f02ac7b7c38f18a Mon Sep 17 00:00:00 2001
From: durch <durch@users.noreply.github.com>
Date: Tue, 16 Dec 2025 18:11:52 +0100
Subject: [PATCH] Return error on session unavailable in
 handle_subsession_packet

Replace .session().ok() with proper error handling to fail fast when
session is Closed or Processing after state machine processing.

Previously, the code silently continued with outer_key = None, which
could cause protocol errors downstream.

Closes: nym-8de0
---
 gateway/src/node/lp_listener/handler.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gateway/src/node/lp_listener/handler.rs b/gateway/src/node/lp_listener/handler.rs
index 770bba68c2..9052183b17 100644
--- a/gateway/src/node/lp_listener/handler.rs
+++ b/gateway/src/node/lp_listener/handler.rs
@@ -453,8 +453,8 @@ impl LpConnectionHandler {
         // Get outer key before releasing borrow
         let outer_key = state_machine
             .session()
-            .ok()
-            .and_then(|s| s.outer_aead_key());
+            .map_err(|e| GatewayError::LpProtocolError(format!("Session unavailable after processing: {}", e)))?
+            .outer_aead_key();
         drop(state_entry);
 
         match action {