From: Jason Liu <r64343@freescale.com>
Date: Sun, 14 Nov 2010 04:23:09 +0000 (+0800)
Subject: net: Fix potential empty DHCP Parameter Request List
X-Git-Tag: v2010.12-rc2~64
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=258ccd68170b7279ec7d4805c7b914c90374e711;p=u-boot

net: Fix potential empty DHCP Parameter Request List

Can't get IP address with dhcp due to the dhcp server not
allow the empty param list request under some network env

This patch is based on Gray Remlin's initial patch.

Signed-off-by: Jason Liu <r64343@freescale.com>
Signed-off-by: Gray Remlin <g_remlin@rocketmail.com>
---

diff --git a/net/bootp.c b/net/bootp.c
index e679f8b7f8..1a717867d4 100644
--- a/net/bootp.c
+++ b/net/bootp.c
@@ -456,6 +456,10 @@ static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t R
 	*e++  = 42;
 	*cnt += 1;
 #endif
+	/* no options, so back up to avoid sending an empty request list */
+	if (*cnt == 0)
+		e -= 2;
+
 	*e++  = 255;		/* End of the list */
 
 	/* Pad to minimal length */