From 9e4da57335e7a03068f4760c24c2421b340ebc8f Mon Sep 17 00:00:00 2001
From: Patricio Whittingslow <graded.sp@gmail.com>
Date: Sat, 11 Apr 2026 20:02:16 -0300
Subject: [PATCH] abort on ControlBlock return net.ErrClosed in challenge ack
 case

---
 tcp/control.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tcp/control.go b/tcp/control.go
index c316dde..7e34937 100644
--- a/tcp/control.go
+++ b/tcp/control.go
@@ -555,6 +555,7 @@ func (tcb *ControlBlock) validateIncomingSegment(seg Segment) (err error) {
 		case errSeqNotInWindow, errLastNotInWindow, errRequireSequential, errZeroWindow:
 			if !flags.HasAny(FlagRST) {
 				if tcb.tooManyChallengeAcks() {
+					tcb.Abort()
 					return net.ErrClosed
 				}
 				tcb.triggerChallengeAckEmit()