[PATCH v3 0/2] drm/tests: Fix for UAF and a test for drm_exec lock alloc tracking warning

[Thomas Hellström]

While trying to replicate a weird drm_exec lock alloc tracking warning
using the drm_exec kunit test, the warning was shadowed by a UAF warning
from KASAN due to a bug in the drm kunit helpers.

Patch 1 fixes that drm kunit UAF.
Patch 2 introduces a drm_exec kunit subtest that fails if the conditions
      for the weird warning are met.

The series previously also had a patch with a drm_exec workaround for the
warning but that patch has already been commited to drm_misc_next_fixes.

v2:
- Rewording of commit messages
- Add some commit message tags
v3:
- Remove an already committed patch
- Rework the test to not require dmesg inspection (Maxime Ripard)
- Condition the test on CONFIG_LOCK_ALLOC
- Update code comments and commit messages (Maxime Ripard)

Cc: Maxime Ripard <mripard at kernel.org>
Cc: Christian König <christian.koenig at amd.com>

Thomas Hellström (2):
  drm/tests: helpers: Avoid a driver uaf
  drm/tests/drm_exec: Add a test for object freeing within
    drm_exec_fini()

 drivers/gpu/drm/tests/drm_exec_test.c | 82 +++++++++++++++++++++++++++
 include/drm/drm_kunit_helpers.h       |  4 +-
 2 files changed, 85 insertions(+), 1 deletion(-)

-- 
2.41.0