From 6bf46367f5f1fd159f8a497d094ecfcbb6bc3c1d Mon Sep 17 00:00:00 2001
From: Ley Foon Tan <ley.foon.tan@intel.com>
Date: Tue, 25 Aug 2020 10:26:35 +0800
Subject: [PATCH] net: tftp: Fix tftp_prev_block counter update

Fixes missing update to tftp_prev_block counter before increase
tftp_cur_block counter when do the tftpput operation.

tftp_prev_block counter is used in update_block_number() function to
check whether block number (sequence number) is rollover. This bug
cause the tftpput command fail to upload a large file when block
number is greater than 16-bit (0xFFFF).

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Reviewed-By: Ramon Fried <rfried.dev@gmail.com>
---
 net/tftp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tftp.c b/net/tftp.c
index 84e970bec1..380094d493 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -502,6 +502,7 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 				int block = ntohs(*s);
 				int ack_ok = (tftp_cur_block == block);
 
+				tftp_prev_block = tftp_cur_block;
 				tftp_cur_block = (unsigned short)(block + 1);
 				update_block_number();
 				if (ack_ok)
-- 
2.39.5