[U-Boot] [PATCH] bootp: Prevent u-boot from using others bootp responses.

[Anton Persson]

>From d53ea5847b92e31563c58804c189afc0fe4773f5 Mon Sep 17 00:00:00 2001
From: Anton Persson <don.juanton at gmail.com>
Date: Thu, 17 Mar 2016 09:38:21 +0100
Subject: [PATCH] bootp: Prevent u-boot from using others responses.

In rare circumstances two dhcp clients may generate the same
bootp ID. If this happens it is vital that the client also checks
the hw address in the received response to prevent IP address conflicts.

Signed-off-by: Anton Persson <don.juanton at gmail.com>
---
 net/bootp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bootp.c b/net/bootp.c
index aefc808..d7852db 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -132,6 +132,8 @@ static int check_reply_packet(uchar *pkt, unsigned
dest, unsigned src,
                retval = -5;
        else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
                retval = -6;
+       else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
+               retval = -7;

        debug("Filtering pkt = %d\n", retval);

-- 
2.1.4