From 100f4756d42036cca5968ef82542ecf6bccbc8a1 Mon Sep 17 00:00:00 2001
From: "Aubrey.Li" <aubreylee@gmail.com>
Date: Tue, 17 Apr 2007 14:46:33 -0700
Subject: [PATCH] Fix netpoll UDP input path

Netpoll UDP input handler needs to pull up the UDP headers
and handle receive checksum offloading properly just like
the normal UDP input path does else we get corrupted
checksums.

[NET]: Fix UDP checksum issue in net poll mode.

In net poll mode, the current checksum function doesn't consider the
kind of packet which is padded to reach a specific minimum length. I
believe that's the problem causing my test case failed. The following
patch fixed this issue.

Signed-off-by: Aubrey.Li <aubreylee@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 net/core/netpoll.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 823215d8e90f6..522e44173e56f 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -471,6 +471,13 @@ int __netpoll_rx(struct sk_buff *skb)
 	if (skb->len < len || len < iph->ihl*4)
 		goto out;
 
+	/*
+	 * Our transport medium may have padded the buffer out.
+	 * Now We trim to the true length of the frame.
+	 */
+	if (pskb_trim_rcsum(skb, len))
+		goto out;
+
 	if (iph->protocol != IPPROTO_UDP)
 		goto out;
 
-- 
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