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| author | Jens Axboe <axboe@kernel.dk> | 2025-01-08 10:28:05 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-01-17 13:40:58 +0100 |
| commit | a7085c3ae43b86d4b3d1b8275e6a67f14257e3b7 (patch) | |
| tree | 55da08598d2ef695590070a9c4f9a873e232d56a /include/net/aligned_data.h | |
| parent | cbb64f5d757fe18e5ac7a6ffb67e8264f2992996 (diff) | |
io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period
Commit c9a40292a44e78f71258b8522655bffaf5753bdb upstream.
io_eventfd_do_signal() is invoked from an RCU callback, but when
dropping the reference to the io_ev_fd, it calls io_eventfd_free()
directly if the refcount drops to zero. This isn't correct, as any
potential freeing of the io_ev_fd should be deferred another RCU grace
period.
Just call io_eventfd_put() rather than open-code the dec-and-test and
free, which will correctly defer it another RCU grace period.
Fixes: 21a091b970cd ("io_uring: signal registered eventfd to process deferred task work")
Reported-by: Jann Horn <jannh@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/net/aligned_data.h')
0 files changed, 0 insertions, 0 deletions