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| author | Mike Snitzer <snitzer@kernel.org> | 2025-10-27 09:08:32 -0400 |
|---|---|---|
| committer | Anna Schumaker <anna.schumaker@oracle.com> | 2025-11-10 10:32:28 -0500 |
| commit | f2060bdc21d70f3d8a4753a9fd3b0b02cb48c0bc (patch) | |
| tree | 93446e27938f939f5d4ab42787d29f50c8d81e18 /lib/debugobjects.c | |
| parent | 51a491f2708de79da76791523d40926921823b7e (diff) | |
nfs/localio: add refcounting for each iocb IO associated with NFS pgio header
Improve completion handling of as many as 3 IOs associated with each
misaligned DIO by using a atomic_t to track completion of each IO.
Update nfs_local_pgio_done() to use precise atomic_t accounting for
remaining iov_iter (up to 3) associated with each iocb, so that each
NFS LOCALIO pgio header is only released after all IOs have completed.
But also allow early return if/when a short read or write occurs.
Fixes reported BUG: KASAN: slab-use-after-free in nfs_local_call_read:
https://lore.kernel.org/linux-nfs/aPSvi5Yr2lGOh5Jh@dell-per750-06-vm-07.rhts.eng.pek2.redhat.com/
Reported-by: Yongcheng Yang <yoyang@redhat.com>
Fixes: c817248fc831 ("nfs/localio: add proper O_DIRECT support for READ and WRITE")
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
Diffstat (limited to 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions