[PATCH rdma-rc 0/2] RDMA/uverbs: Fix DMABUF lifetime bugs

[Deep Shah <deepshah146@gmail.com>]

Fix two lifetime bugs in the uverbs DMABUF export path. Patch 1 fixes
leaked uobject and ufile references when the uverbs FD is closed first.
Patch 2 fixes a use-after-free when dma-buf release races with ufile
cleanup.

Tested on mainline 4056b3c9d3c9 in x86_64 QEMU with KASAN and lockdep,
using test-only siw export hooks. The unpatched kernel reproduces both
bugs. Patch 1 fixes the leak, confirmed by tracing ufile release. With
both patches, the same tests complete without KASAN or lockdep reports.

The tests cover core export and teardown, not real mlx5 hardware,
importer DMA mappings, device removal, or allocation abort. The abort
issue in patch 1 is based on source review. Testing on mlx5 would be
helpful.

Deep Shah (2):
  RDMA/uverbs: Fix uobject leak in DMABUF release
  RDMA/uverbs: Fix DMABUF use-after-free during ufile cleanup

 drivers/infiniband/core/ib_core_uverbs.c      | 10 +---
 drivers/infiniband/core/uverbs.h              | 37 +++++++++++++++
 .../infiniband/core/uverbs_std_types_dmabuf.c | 46 +++++++++++--------
 3 files changed, 66 insertions(+), 27 deletions(-)


base-commit: 72d3fcf802c45d00b300f25b848a93c3a2bd7c7e