io_uring: fix off-by-one in sync cancelation file check
The passed in index should be validated against the number of registered files we have, it needs to be smaller than the index value to avoid going one beyond the end. Fixes: 78a861b9 ("io_uring: add sync cancelation API through io_uring_register()") Reported-by: Luo Likang <luolikang@nsfocus.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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