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netvsc: need rcu_derefence when accessing internal device info

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The netvsc_device structure should be accessed by rcu_dereference
in the send path.  Change arguments to netvsc_send() to make
this easier to do correctly.

Remove no longer needed hv_device_to_netvsc_device.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger
2017-07-19 11:53:17 -07:00
committed by David S. Miller
parent 9749fed5d4
commit 2a926f7912
4 changed files with 11 additions and 13 deletions
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8
drivers/net/hyperv/netvsc.c
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@@ -822,13 +822,15 @@ static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
msdp->count = 0;
}
int netvsc_send(struct hv_device *device,
/* RCU already held by caller */
int netvsc_send(struct net_device_context *ndev_ctx,
struct hv_netvsc_packet *packet,
struct rndis_message *rndis_msg,
struct hv_page_buffer **pb,
struct sk_buff *skb)
{
struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
struct netvsc_device *net_device = rcu_dereference(ndev_ctx->nvdev);
struct hv_device *device = ndev_ctx->device_ctx;
int ret = 0;
struct netvsc_channel *nvchan;
u32 pktlen = packet->total_data_buflen, msd_len = 0;
@@ -840,7 +842,7 @@ int netvsc_send(struct hv_device *device,
bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
/* If device is rescinded, return error and packet will get dropped. */
if (unlikely(net_device->destroy))
if (unlikely(!net_device || net_device->destroy))
return -ENODEV;
/* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get