[PATCH net 1/1] hyperv: Fix a bug in netvsc_send()

K. Y. Srinivasan
2014-10-05T16:40:47Z

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

David, please queue this up for stable.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reported-by: Sitsofe Wheeler <sitsofe@yahoo.com>
---
drivers/net/hyperv/netvsc.c | 15 ++++++++-------
1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 977984b..7d76c95 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -717,6 +717,7 @@ int netvsc_send(struct hv_device *device,
unsigned int section_index = NETVSC_INVALID_INDEX;
u32 msg_size = 0;
struct sk_buff *skb;
+ u16 q_idx = packet->q_idx;

net_device = get_outbound_net_device(device);
@@ -781,24 +782,24 @@ int netvsc_send(struct hv_device *device,

if (ret == 0) {
atomic_inc(&net_device->num_outstanding_sends);
- atomic_inc(&net_device->queue_sends[packet->q_idx]);
+ atomic_inc(&net_device->queue_sends[q_idx]);

if (hv_ringbuf_avail_percent(&out_channel->outbound) <
RING_AVAIL_PERCENT_LOWATER) {
netif_tx_stop_queue(netdev_get_tx_queue(
- ndev, packet->q_idx));
+ ndev, q_idx));

if (atomic_read(&net_device->
- queue_sends[packet->q_idx]) < 1)
+ queue_sends[q_idx]) < 1)
netif_tx_wake_queue(netdev_get_tx_queue(
- ndev, packet->q_idx));
+ ndev, q_idx));
}
} else if (ret == -EAGAIN) {
netif_tx_stop_queue(netdev_get_tx_queue(
- ndev, packet->q_idx));
- if (atomic_read(&net_device->queue_sends[packet->q_idx]) < 1) {
+ ndev, q_idx));
+ if (atomic_read(&net_device->queue_sends[q_idx]) < 1) {
netif_tx_wake_queue(netdev_get_tx_queue(
- ndev, packet->q_idx));
+ ndev, q_idx));
ret = -ENOSPC;
}
} else {
--
1.7.4.1