io_uring/fs: remove sqe->rw_flags checking from LINKAT
commita52d4f6575
upstream. This is unionized with the actual link flags, so they can of course be set and they will be evaluated further down. If not we fail any LINKAT that has to set option flags. Fixes:cf30da90bc
("io_uring: add support for IORING_OP_LINKAT") Cc: stable@vger.kernel.org Reported-by: Thomas Leonard <talex5@gmail.com> Link: https://github.com/axboe/liburing/issues/955 Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -243,7 +243,7 @@ int io_linkat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
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struct io_link *lnk = io_kiocb_to_cmd(req, struct io_link);
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const char __user *oldf, *newf;
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if (sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
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if (sqe->buf_index || sqe->splice_fd_in)
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return -EINVAL;
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if (unlikely(req->flags & REQ_F_FIXED_FILE))
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return -EBADF;
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