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io_uring: remove double poll entry on arm failure

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commit 46fee9ab02cb24979bbe07631fc3ae95ae08aa3e upstream.

__io_queue_proc() can enqueue both poll entries and still fail
afterwards, so the callers trying to cancel it should also try to remove
the second poll entry (if any).

For example, it may leave the request alive referencing a io_uring
context but not accessible for cancellation:

[  282.599913][ T1620] task:iou-sqp-23145   state:D stack:28720 pid:23155 ppid:  8844 flags:0x00004004
[  282.609927][ T1620] Call Trace:
[  282.613711][ T1620]  __schedule+0x93a/0x26f0
[  282.634647][ T1620]  schedule+0xd3/0x270
[  282.638874][ T1620]  io_uring_cancel_generic+0x54d/0x890
[  282.660346][ T1620]  io_sq_thread+0xaac/0x1250
[  282.696394][ T1620]  ret_from_fork+0x1f/0x30

Cc: stable@vger.kernel.org
Fixes: 18bceab101 ("io_uring: allow POLL_ADD with double poll_wait() users")
Reported-and-tested-by: syzbot+ac957324022b7132accf@syzkaller.appspotmail.com
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0ec1228fc5eda4cb524eeda857da8efdc43c331c.1626774457.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2021-07-20 10:50:44 +01:00 committed by Greg Kroah-Hartman
parent 9eef902915
commit fca5343b48
1 changed files with 2 additions and 0 deletions
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2
fs/io_uring.c
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@ -5219,6 +5219,8 @@ static __poll_t __io_arm_poll_handler(struct io_kiocb *req,
ipt->error = -EINVAL;
spin_lock_irq(&ctx->completion_lock);
if (ipt->error)
io_poll_remove_double(req);
if (likely(poll->head)) {
spin_lock(&poll->head->lock);
if (unlikely(list_empty(&poll->wait.entry))) {