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io_uring: fix ltimeout unprep 

io_unprep_linked_timeout() is broken, first it needs to return back
REQ_F_ARM_LTIMEOUT, so the linked timeout is enqueued and disarmed. But
now we refcounted it, and linked timeouts may get not executed at all,
leaking a request.

Just kill the unprep optimisation.

Fixes: 906c6caaf5 ("io_uring: optimise io_prep_linked_timeout()")
Reported-by: Beld Zhang <beldzhang@gmail.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/51b8e2bfc4bea8ee625cf2ba62b2a350cc9be031.1634719585.git.asml.silence@gmail.com
Link: https://github.com/axboe/liburing/issues/460
Reported-by: Beld Zhang <beldzhang@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-10-20 09:53:02 +01:00 committed by Jens Axboe
parent e139a1ec92
commit 4ea672ab69
1 changed files with 1 additions and 6 deletions
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7
fs/io_uring.c
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@ -1370,11 +1370,6 @@ static void io_req_track_inflight(struct io_kiocb *req)
}
}
static inline void io_unprep_linked_timeout(struct io_kiocb *req)
{
req->flags &= ~REQ_F_LINK_TIMEOUT;
}
static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req)
{
if (WARN_ON_ONCE(!req->link))
@ -6985,7 +6980,7 @@ issue_sqe:
switch (io_arm_poll_handler(req)) {
case IO_APOLL_READY:
if (linked_timeout)
io_unprep_linked_timeout(req);
io_queue_linked_timeout(linked_timeout);
goto issue_sqe;
case IO_APOLL_ABORTED:
/*