[PATCH 5.13 795/800] io_uring: add IOPOLL and reserved field checks to IORING_OP_RENAMEAT

[Greg Kroah-Hartman]

From: Jens Axboe <axboe@xxxxxxxxx>

commit ed7eb2592286ead7d3bfdf8adf65e65392167cc4 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: 80a261fd0032 ("io_uring: add support for IORING_OP_RENAMEAT")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Dmitry Kadashev <dkadashev@xxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3453,6 +3453,10 @@ static int io_renameat_prep(struct io_ki
 	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;