From 39b00333253c80698843e81e3fe4a14ed21af709 Mon Sep 17 00:00:00 2001
From: "Joseph C. Lehner" <joseph.c.lehner@gmail.com>
Date: Sun, 7 Feb 2016 21:21:43 +0100
Subject: [PATCH] Fix TFTP code

---
 tftp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tftp.c b/tftp.c
index 7c21304..9d6ae51 100644
--- a/tftp.c
+++ b/tftp.c
@@ -150,7 +150,7 @@ static ssize_t tftp_recvfrom(int sock, char *pkt, uint16_t* port,
 		 */
 		fprintf(stderr, "Error: %.32s\n", pkt);
 		return -3;
-	} else {
+	} else if (!opcode || opcode > ERR) {
 		fprintf(stderr, "Received invalid packet: ");
 		pkt_print(pkt, stderr);
 		fprintf(stderr, ".\n");
-- 
2.25.1