fuzz/lnwire: adding fuzz harnesses for all lnwire messages + zlib

fuzz/lnwire/update_fail_htlc.go

@@ -0,0 +1,20 @@
+// +build gofuzz
+
+package lnwirefuzz
+
+import (
+	"github.com/lightningnetwork/lnd/lnwire"
+)
+
+// Fuzz_update_fail_htlc is used by go-fuzz.
+func Fuzz_update_fail_htlc(data []byte) int {
+	// Prefix with MsgUpdateFailHTLC.
+	data = prefixWithMsgType(data, lnwire.MsgUpdateFailHTLC)
+
+	// Create an empty message so that the FuzzHarness func can check
+	// if the max payload constraint is violated.
+	emptyMsg := lnwire.UpdateFailHTLC{}
+
+	// Pass the message into our general fuzz harness for wire messages!
+	return harness(data, &emptyMsg)
+}