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Arm SCMI fixes for v6.2

Browse source 
Few fixes addressing:
 1. Possible compromise with the shorter message size from a misbheaving
    SCMI platform firmware. The shmem accesses are now hardened to handle
    the same in fetch_notification and fetch_response.
 
 2. Possible unsafe locking scenario which is solved by calling
    virtio_break_device() before getting hold of vioch->lock.
 
 3. Possible stale error status reported from a previous message being
    used again as it is not cleared.
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Merge tag 'scmi-fixes-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm SCMI fixes for v6.2

Few fixes addressing:
1. Possible compromise with the shorter message size from a misbheaving
   SCMI platform firmware. The shmem accesses are now hardened to handle
   the same in fetch_notification and fetch_response.

2. Possible unsafe locking scenario which is solved by calling
   virtio_break_device() before getting hold of vioch->lock.

3. Possible stale error status reported from a previous message being
   used again as it is not cleared.

* tag 'scmi-fixes-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_scmi: Fix virtio channels cleanup on shutdown
  firmware: arm_scmi: Harden shared memory access in fetch_notification
  firmware: arm_scmi: Harden shared memory access in fetch_response
  firmware: arm_scmi: Clear stale xfer->hdr.status

Link: https://lore.kernel.org/r/20230106093909.652657-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2023-01-09 23:15:08 +01:00
commit a316877372
3 changed files with 14 additions and 4 deletions
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