In the Linux kernel, the following vulnerability has been resolved:
iommufd: Release current IOAS on xa_store() failure
iommufd_take_all_iova_rwsem() takes an object reference and the
iova_rwsem write lock before storing the IOAS in the temporary ioas_list
xarray.
If xa_store() fails, the current IOAS has not been inserted into
ioas_list yet. iommufd_release_all_iova_rwsem() only unwinds IOAS
objects already present in that xarray, so it cannot release the current
IOAS.
Release the current IOAS rwsem and object reference before unwinding the
previously stored entries.
References 3
https://git.kernel.org/stable/c/07b4fe1367f076886c1c47a19c70936138325087
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4ac2ce123824d5f885c868fa1f9f4d463141a2ba
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4c33d00ad9a911e87ea222986f732ce072e3aa26
416baaa9-dc9f-4396-8d5f-8c081fb06d67