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.co...
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(-)