[PATCH v2 0/2] Fix a race condition vulnerability in "_show" functions

[Kimberly Brown <kimbrownkd@gmail.com>]

This patchset fixes a race condition vulnerability in the "_show"
functions that access a channel ring buffer.

Changes in v2:
 - In v1, I proposed using “vmbus_connection.channel_mutex” in the
   “_show” functions to prevent the race condition. However, using this
   mutex could result in a deadlock, so a new approach is needed.

 - Patch 1 is new and consists of a code refactor.

 - Patch 2 introduces a new mutex lock in the “vmbus_channel” struct,
   and the new mutex is used to eliminate the race condition.

Kimberly Brown (2):
  Drivers: hv: vmbus: Refactor chan->state if statement
  Drivers: hv: vmbus: Add a channel ring buffer mutex lock

 drivers/hv/channel.c      |   5 ++
 drivers/hv/channel_mgmt.c |   1 +
 drivers/hv/ring_buffer.c  |  11 +++-
 drivers/hv/vmbus_drv.c    | 118 ++++++++++++++++++++++++++------------
 include/linux/hyperv.h    |  10 +++-
 5 files changed, 104 insertions(+), 41 deletions(-)

-- 
2.17.1