Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 517/717] io_uring: fix 0-iov read buffer select | Date | Mon, 28 Dec 2020 13:48:35 +0100 |
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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
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