[PATCH 0/2] drm/syncobj: fix sync_file import into timeline points

[Julian Orth]

Importing a sync_file into a timeline point
(DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_IMPORT_SYNC_FILE |
DRM_SYNCOBJ_FD_TO_HANDLE_FLAGS_TIMELINE) has two bugs since
c2d3a7300695:

1. The fence and syncobj references leak if dma_fence_chain_alloc()
   fails.
2. A sync_file that contains a dma_fence_chain (e.g. one exported from a
   timeline point) is wrapped in another chain and triggers the
   WARN_ON in dma_fence_chain_init(). I reported this on 2026-05-20.

These patches were developed completely autonomously by AI. I have
reviewed them, but they have not been tested at runtime. They are only
compile-tested.

Julian Orth (2):
  drm/syncobj: fix fence and syncobj leak in
    drm_syncobj_import_sync_file_fence
  drm/syncobj: flatten chains when importing sync_file into timeline
    point

 drivers/gpu/drm/drm_syncobj.c | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)


base-commit: 6ccf996a0dec1852dab94ad865f27b4904750e12
-- 
2.56.0