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vmbus: hvsock: add proper sync for vmbus_hvsock_device_unregister()

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Without the patch, vmbus_hvsock_device_unregister() can destroy the device
prematurely when close() is called, and can cause NULl dereferencing or
potential data loss (the last portion of the data stream may be dropped
prematurely).

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dexuan Cui 2017-10-18 02:08:40 -07:00 • committed by Greg Kroah-Hartman
parent 66b83a4cdd
commit 9d35593b4f
1 changed files with 4 additions and 1 deletions
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5
drivers/hv/channel_mgmt.c
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@ -937,7 +937,10 @@ void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
{ {
BUG_ON(!is_hvsock_channel(channel)); BUG_ON(!is_hvsock_channel(channel));
channel->rescind = true; /* We always get a rescind msg when a connection is closed. */
while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind))
msleep(1);
vmbus_device_unregister(channel->device_obj); vmbus_device_unregister(channel->device_obj);
} }
EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister);