From: Pavel Begunkov <[email protected]> commit dd20166236953c8cd14f4c668bf972af32f0c6be upstream.
Doing vectored buf-select read with 0 iovec passed is meaningless and utterly broken, forbid it. Cc: <[email protected]> # 5.7+ Signed-off-by: Pavel Begunkov <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- 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
