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    Subject[PATCH 5.13 796/800] io_uring: add IOPOLL and reserved field checks to IORING_OP_UNLINKAT
    Date
    From: Jens Axboe <axboe@kernel.dk>

    commit 22634bc5620d29765e5199c7b230a372c7ddcda2 upstream.

    We can't support IOPOLL with non-pollable request types, and we should
    check for unused/reserved fields like we do for other request types.

    Fixes: 14a1143b68ee ("io_uring: add support for IORING_OP_UNLINKAT")
    Cc: stable@vger.kernel.org
    Reported-by: Dmitry Kadashev <dkadashev@gmail.com>
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/io_uring.c | 4 ++++
    1 file changed, 4 insertions(+)

    --- a/fs/io_uring.c
    +++ b/fs/io_uring.c
    @@ -3504,6 +3504,10 @@ static int io_unlinkat_prep(struct io_ki
    struct io_unlink *un = &req->unlink;
    const char __user *fname;

    + if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
    + return -EINVAL;
    + if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index)
    + return -EINVAL;
    if (unlikely(req->flags & REQ_F_FIXED_FILE))
    return -EBADF;


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