in tftpboot, if ack was already sent previously for this
packet, don't send again.

Fixes: cc6b87ecaa96 ("net: tftp: Add client support for RFC 7440")

Reported-by: Suneel Garapati <suneelgli...@gmail.com>
Signed-off-by: Ramon Fried <rfried....@gmail.com>
---
 net/tftp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tftp.c b/net/tftp.c
index 03079ded34..1111834f71 100644
--- a/net/tftp.c
+++ b/net/tftp.c
@@ -678,7 +678,8 @@ static void tftp_handler(uchar *pkt, unsigned dest, struct 
in_addr sip,
                }
 
                if (len < tftp_block_size) {
-                       tftp_send();
+                       if (tftp_cur_block != tftp_next_ack)
+                               tftp_send();
                        tftp_complete();
                }
                break;
-- 
2.17.1

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