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authorHaiyang Zhang <haiyangz@microsoft.com>2012-08-03 09:32:18 +0000
committerDavid S. Miller <davem@davemloft.net>2012-08-03 16:51:11 -0700
commitae9e63bb2c0cf5437d9d13d822b27149336c6e0e (patch)
tree208ca440bec48067d84fbd86f04fa79bb55d00c3
parent2207b60ffb6545040e2e2620fced13deba7643c2 (diff)
downloadop-kernel-dev-ae9e63bb2c0cf5437d9d13d822b27149336c6e0e.zip
op-kernel-dev-ae9e63bb2c0cf5437d9d13d822b27149336c6e0e.tar.gz
hyperv: Move wait completion msg code into rndis_filter_halt_device()
We need to wait for send_completion msg before put_rndis_request() at the end of rndis_filter_halt_device(). Otherwise, netvsc_send_completion() may reference freed memory which is overwritten, and cause panic. Reported-by: Long Li <longli@microsoft.com> Reported-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/hyperv/netvsc.c7
-rw-r--r--drivers/net/hyperv/rndis_filter.c11
2 files changed, 11 insertions, 7 deletions
diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 6cee291..4a1a5f5 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -383,13 +383,6 @@ int netvsc_device_remove(struct hv_device *device)
unsigned long flags;
net_device = hv_get_drvdata(device);
- spin_lock_irqsave(&device->channel->inbound_lock, flags);
- net_device->destroy = true;
- spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
-
- /* Wait for all send completions */
- wait_event(net_device->wait_drain,
- atomic_read(&net_device->num_outstanding_sends) == 0);
netvsc_disconnect_vsp(net_device);
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index e5d6146..1e88a10 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -718,6 +718,9 @@ static void rndis_filter_halt_device(struct rndis_device *dev)
{
struct rndis_request *request;
struct rndis_halt_request *halt;
+ struct netvsc_device *nvdev = dev->net_dev;
+ struct hv_device *hdev = nvdev->dev;
+ ulong flags;
/* Attempt to do a rndis device halt */
request = get_rndis_request(dev, RNDIS_MSG_HALT,
@@ -735,6 +738,14 @@ static void rndis_filter_halt_device(struct rndis_device *dev)
dev->state = RNDIS_DEV_UNINITIALIZED;
cleanup:
+ spin_lock_irqsave(&hdev->channel->inbound_lock, flags);
+ nvdev->destroy = true;
+ spin_unlock_irqrestore(&hdev->channel->inbound_lock, flags);
+
+ /* Wait for all send completions */
+ wait_event(nvdev->wait_drain,
+ atomic_read(&nvdev->num_outstanding_sends) == 0);
+
if (request)
put_rndis_request(dev, request);
return;
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