[Intel-gfx] [PATCH 0/3] drm, drm/vmwgfx: fixes and updates related to drm_master

[Desmond Cheong Zhi Xi]

Hi,

This series contains some improvements that Daniel Vetter proposed following a discussion on a recent series:
https://lore.kernel.org/lkml/20210712043508.11584-1-desmondcheongzx@gmail.com/

While preparing these patches, I also noticed some unprotected uses of drm_master in the vmwgfx driver that can be addressed by new functions from the previous series.

This series is thus broken up into three patches:

1. Switch from the outer drm_device.master_mutex to the inner drm_file.master_lookup_lock in drm_is_current_master.

2. Update the kerneldoc for lease fields in drm_master to clarify lifetime/locking rules.

3. Prevent potential use-after-free bugs by replacing calls to drm_master_get with drm_file_get_master in vmwgfx_surface.c.

Best wishes,
Desmond

Desmond Cheong Zhi Xi (3):
  drm: use the lookup lock in drm_is_current_master
  drm: clarify lifetime/locking for drm_master's lease fields
  drm/vmwgfx: fix potential UAF in vmwgfx_surface.c

 drivers/gpu/drm/drm_auth.c              |  9 ++--
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c |  4 +-
 include/drm/drm_auth.h                  | 62 ++++++++++++++++++++-----
 3 files changed, 58 insertions(+), 17 deletions(-)

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2.25.1