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hyperv: Fix the total_data_buflen in send path

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total_data_buflen is used by netvsc_send() to decide if a packet can be put
into send buffer. It should also include the size of RNDIS message before the
Ethernet frame. Otherwise, a messge with total size bigger than send_section_size
may be copied into the send buffer, and cause data corruption.

[Request to include this patch to the Stable branches]

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haiyang Zhang 2014-10-22 13:47:18 -07:00 committed by David S. Miller
parent f765678e32
commit 942396b019
1 changed files with 1 additions and 0 deletions
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1
drivers/net/hyperv/netvsc_drv.c
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@ -550,6 +550,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
do_send:
/* Start filling in the page buffers with the rndis hdr */
rndis_msg->msg_len += rndis_msg_size;
packet->total_data_buflen = rndis_msg->msg_len;
packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
skb, &packet->page_buf[0]);