netdev - [PATCH] netpoll: Fix skb tail pointer in netpoll_send

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Message-ID: <1339496765-3093-1-git-send-email-bogdan.hamciuc@freescale.com>
Date:	Tue, 12 Jun 2012 13:26:04 +0300
From:	Bogdan Hamciuc <bogdan.hamciuc@...escale.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>,
	Bogdan Hamciuc <bogdan.hamciuc@...escale.com>
Subject: [PATCH] netpoll: Fix skb tail pointer in netpoll_send_udp()

As skb->tail wasn't updated after skb_copy_to_linear_data(), subsequent
calls to skb_realloc_headroom() (as made by an ethernet driver's
ndo_start_xmit routine) would only effectively copy the packet headers,
leaving garbage in the payload.

In the process, removed some unnecessary code.

Signed-off-by: Bogdan Hamciuc <bogdan.hamciuc@...escale.com>
---
 net/core/netpoll.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 3d84fb9..9a08068 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -362,22 +362,22 @@ EXPORT_SYMBOL(netpoll_send_skb_on_dev);
 
 void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
 {
-	int total_len, eth_len, ip_len, udp_len;
+	int total_len, ip_len, udp_len;
 	struct sk_buff *skb;
 	struct udphdr *udph;
 	struct iphdr *iph;
 	struct ethhdr *eth;
 
 	udp_len = len + sizeof(*udph);
-	ip_len = eth_len = udp_len + sizeof(*iph);
-	total_len = eth_len + ETH_HLEN + NET_IP_ALIGN;
+	ip_len = udp_len + sizeof(*iph);
+	total_len = ip_len + ETH_HLEN + NET_IP_ALIGN;
 
 	skb = find_skb(np, total_len, total_len - len);
 	if (!skb)
 		return;
 
 	skb_copy_to_linear_data(skb, msg, len);
-	skb->len += len;
+	skb_put(skb, len);
 
 	skb_push(skb, sizeof(*udph));
 	skb_reset_transport_header(skb);
-- 
1.5.6.3


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