[PATCH 3.16 38/55] hyperv: Fix a bug in netvsc_start_xmit()

[Greg Kroah-Hartman]

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: KY Srinivasan <kys@xxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxx>.

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@xxxxxxxxxxxxx>
Tested-by: Long Li <longli@xxxxxxxxxxxxx>
Tested-by: Sitsofe Wheeler <sitsofe@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/hyperv/netvsc_drv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -387,6 +387,7 @@ static int netvsc_start_xmit(struct sk_b
 	int  hdr_offset;
 	u32 net_trans_info;
 	u32 hash;
+	u32 skb_length = skb->len;
 
 
 	/* We will atmost need two pages to describe the rndis
@@ -562,7 +563,7 @@ do_send:
 
 drop:
 	if (ret == 0) {
-		net->stats.tx_bytes += skb->len;
+		net->stats.tx_bytes += skb_length;
 		net->stats.tx_packets++;
 	} else {
 		kfree(packet);


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