[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20220628150228.1379645-4-dylany@fb.com>
Date: Tue, 28 Jun 2022 08:02:23 -0700
From: Dylan Yudaken <dylany@...com>
To: Jens Axboe <axboe@...nel.dk>,
Pavel Begunkov <asml.silence@...il.com>,
<io-uring@...r.kernel.org>
CC: <Kernel-team@...com>, <linux-kernel@...r.kernel.org>,
Dylan Yudaken <dylany@...com>
Subject: [PATCH for-next 3/8] io_uring: allow iov_len = 0 for recvmsg and buffer select
When using BUFFER_SELECT there is no technical requirement that the user
actually provides iov, and this removes one copy_from_user call.
So allow iov_len to be 0.
Signed-off-by: Dylan Yudaken <dylany@...com>
---
io_uring/net.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/io_uring/net.c b/io_uring/net.c
index 19a805c3814c..5e84f7ab92a3 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -300,12 +300,18 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
return ret;
if (req->flags & REQ_F_BUFFER_SELECT) {
- if (iov_len > 1)
+ if (iov_len == 0) {
+ sr->len = iomsg->fast_iov[0].iov_len = 0;
+ iomsg->fast_iov[0].iov_base = NULL;
+ iomsg->free_iov = NULL;
+ } else if (iov_len > 1) {
return -EINVAL;
- if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov)))
- return -EFAULT;
- sr->len = iomsg->fast_iov[0].iov_len;
- iomsg->free_iov = NULL;
+ } else {
+ if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov)))
+ return -EFAULT;
+ sr->len = iomsg->fast_iov[0].iov_len;
+ iomsg->free_iov = NULL;
+ }
} else {
iomsg->free_iov = iomsg->fast_iov;
ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
--
2.30.2
Powered by blists - more mailing lists