io_uring: add IOPOLL and reserved field checks to IORING_OP_RENAMEAT

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: 80a261f ("io_uring: add support for IORING_OP_RENAMEAT")
Cc: [email protected]
Reported-by: Dmitry Kadashev <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: axboe

fs/io_uring.c

@@ -3463,6 +3463,10 @@ static int io_renameat_prep(struct io_kiocb *req,
 	struct io_rename *ren = &req->rename;
 	const char __user *oldf, *newf;
 
+	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
+		return -EINVAL;
+	if (sqe->ioprio || sqe->buf_index)
+		return -EINVAL;
 	if (unlikely(req->flags & REQ_F_FIXED_FILE))
 		return -EBADF;