diff -r 5b1777d3a58e src/pkg/crypto/tls/handshake_messages.go
--- a/src/pkg/crypto/tls/handshake_messages.go	Fri Sep 14 12:53:30 2012 +1000
+++ b/src/pkg/crypto/tls/handshake_messages.go	Sun Sep 16 14:32:14 2012 +0100
@@ -474,7 +474,7 @@
 		switch extension {
 		case extensionNextProtoNeg:
 			m.nextProtoNeg = true
-			d := data
+			d := data[:length]
 			for len(d) > 0 {
 				l := int(d[0])
 				d = d[1:]