From e7430ef23628cf29a6bd28b288b6205bcfd88683 Mon Sep 17 00:00:00 2001
From: healthykim <bsbs8645@snu.ac.kr>
Date: Tue, 17 Mar 2026 17:12:39 +0900
Subject: [PATCH] add fromAddr check

---
 cmd/devp2p/internal/v5test/framework.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/cmd/devp2p/internal/v5test/framework.go b/cmd/devp2p/internal/v5test/framework.go
index fc3c73dd24..e8b7cb636b 100644
--- a/cmd/devp2p/internal/v5test/framework.go
+++ b/cmd/devp2p/internal/v5test/framework.go
@@ -229,10 +229,14 @@ func (tc *conn) read(c net.PacketConn) v5wire.Packet {
 	if err := c.SetReadDeadline(time.Now().Add(waitTime)); err != nil {
 		return &readError{err}
 	}
-	n, _, err := c.ReadFrom(buf)
+	n, fromAddr, err := c.ReadFrom(buf)
 	if err != nil {
 		return &readError{err}
 	}
+	// Verify the packet is from an expected remote address.
+	if fromAddr.String() != tc.remoteAddrFor(c).String() {
+		return readErrorf("packet from unexpected address %v", fromAddr)
+	}
 	// Always use remoteAddr for codec session lookup, even if the actual sender
 	// address differs (e.g. in multi-network setups where packets are routed
 	// through a different interface).