Messages in this thread Patch in this message | | | From | Dylan Yudaken <> | Subject | [PATCH for-next 1/8] io_uring: allow 0 length for buffer select | Date | Tue, 28 Jun 2022 08:02:21 -0700 |
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If user gives 0 for length, we can set it from the available buffer size.
Signed-off-by: Dylan Yudaken <dylany@fb.com> --- io_uring/kbuf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index 8e4f1e8aaf4a..4ed5102461bf 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -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; -- 2.30.2
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