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io_uring/net: fail zc send when unsupported by socket

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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: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/2db3c7f16bb6efab4b04569cd16e6242b40c5cb3.1666346426.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-10-21 11:16:40 +01:00 committed by Jens Axboe
parent e993ffe3da
commit edf8143879
1 changed files with 2 additions and 0 deletions
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2
io_uring/net.c
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@ -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;