Commit edf81438 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io_uring/net: fail zc send when unsupported by socket 



If a protocol doesn't support zerocopy it will silently fall back to
copying. This type of behaviour has always been a source of troubles
so it's better to fail such requests instead.

Cc: <stable@vger.kernel.org> # 6.0
Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2db3c7f16bb6efab4b04569cd16e6242b40c5cb3.1666346426.git.asml.silence@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent e993ffe3

io_uring/net.c

+2 −0
Original line number Diff line number Diff line
@@ -1056,6 +1056,8 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags) 
	sock = sock_from_file(req->file);

	if (unlikely(!sock))

		return -ENOTSOCK;

	if (!test_bit(SOCK_SUPPORT_ZC, &sock->flags))

		return -EOPNOTSUPP;



	msg.msg_name = NULL;

	msg.msg_control = NULL;