| From dd20166236953c8cd14f4c668bf972af32f0c6be Mon Sep 17 00:00:00 2001 |
| From: Pavel Begunkov <asml.silence@gmail.com> |
| Date: Sat, 19 Dec 2020 03:15:43 +0000 |
| Subject: io_uring: fix 0-iov read buffer select |
| |
| From: Pavel Begunkov <asml.silence@gmail.com> |
| |
| commit dd20166236953c8cd14f4c668bf972af32f0c6be upstream. |
| |
| Doing vectored buf-select read with 0 iovec passed is meaningless and |
| utterly broken, forbid it. |
| |
| Cc: <stable@vger.kernel.org> # 5.7+ |
| Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> |
| Signed-off-by: Jens Axboe <axboe@kernel.dk> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| fs/io_uring.c | 4 +--- |
| 1 file changed, 1 insertion(+), 3 deletions(-) |
| |
| --- a/fs/io_uring.c |
| +++ b/fs/io_uring.c |
| @@ -3048,9 +3048,7 @@ static ssize_t io_iov_buffer_select(stru |
| iov[0].iov_len = kbuf->len; |
| return 0; |
| } |
| - if (!req->rw.len) |
| - return 0; |
| - else if (req->rw.len > 1) |
| + if (req->rw.len != 1) |
| return -EINVAL; |
| |
| #ifdef CONFIG_COMPAT |
