6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
commit 4fe82aedeb8a8cb09bfa60f55ab57b5c10a74ac4 upstream.
cac9e4418f4cb ("io_uring/net: save msghdr->msg_control for retries")
reinstatiates msg_control before every __sys_sendmsg_sock(), since the
function can overwrite the value in msghdr. We need to do same for
zerocopy sendmsg.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 493108d95f146 ("io_uring/net: zerocopy sendmsg")
Link: https://github.com/axboe/liburing/issues/1067
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/cc1d5d9df0576fa66ddad4420d240a98a020b267.1712596179.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/net.c | 1 +
1 file changed, 1 insertion(+)
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -1229,6 +1229,7 @@ int io_sendmsg_zc(struct io_kiocb *req,
if (req_has_async_data(req)) {
kmsg = req->async_data;
+ kmsg->msg.msg_control_user = sr->msg_control;
} else {
ret = io_sendmsg_copy_hdr(req, &iomsg);
if (ret)
