io_uring: hold 'ctx' reference around task_work queue + execute

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We're holding the request reference, but we need to go one higher
to ensure that the ctx remains valid after the request has finished.
If the ring is closed with pending task_work inflight, and the
given io_kiocb finishes sync during issue, then we need a reference
to the ring itself around the task_work execution cycle.

Cc: stable@vger.kernel.org # v5.7+
Reported-by: syzbot+9b260fc33297966f5a8e@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2020-08-11 08:04:14 -06:00

parent efa8480a83

commit 6d816e088c

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fs/io_uring.c

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