hyperv: Fix a bug in netvsc_start_xmit()

[ Upstream commit dedb845ded56ded1c62f5398a94ffa8615d4592d ]

After the packet is successfully sent, we should not touch the skb
as it may have been freed. This patch is based on the work done by
Long Li <longli@microsoft.com>.

In this version of the patch I have fixed issues pointed out by David.
David, please queue this up for stable.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Tested-by: Long Li <longli@microsoft.com>
Tested-by: Sitsofe Wheeler <sitsofe@yahoo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index bd3b3acd04dcdadff7c02e0bd41944fa66b17056..994ace9747420a0c9dde0d097471be99409cb1fc 100644 (file)
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -388,6 +388,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
        int  hdr_offset;
        u32 net_trans_info;
        u32 hash;
+       u32 skb_length = skb->len;
 
 
        /* We will atmost need two pages to describe the rndis