Commit b8c01559 authored by Dylan Yudaken's avatar Dylan Yudaken Committed by Jens Axboe
Browse files

io_uring: allow 0 length for buffer select 



If user gives 0 for length, we can set it from the available buffer size.

Signed-off-by: default avatarDylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220630091231.1456789-2-dylany@fb.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6e73dffb

io_uring/kbuf.c

+2 −2
Original line number Diff line number Diff line
@@ -115,7 +115,7 @@ static void __user *io_provided_buffer_select(struct io_kiocb *req, size_t *len, 


		kbuf = list_first_entry(&bl->buf_list, struct io_buffer, list);

		list_del(&kbuf->list);

		if (*len > kbuf->len)

		if (*len == 0 || *len > kbuf->len)

			*len = kbuf->len;

		req->flags |= REQ_F_BUFFER_SELECTED;

		req->kbuf = kbuf;
@@ -145,7 +145,7 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len, 
		buf = page_address(bl->buf_pages[index]);

		buf += off;

	}

	if (*len > buf->len)

	if (*len == 0 || *len > buf->len)

		*len = buf->len;

	req->flags |= REQ_F_BUFFER_RING;

	req->buf_list = bl;