diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2022-10-21 11:16:40 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-10-22 08:43:03 -0600 |
| commit | edf81438799ccead7122948446d7e44b083e788d (patch) | |
| tree | c4d5c3ce1ed31c57c03947566bccd2d33e18f55e /io_uring | |
| parent | e993ffe3da4bcddea0536b03be1031bf35cd8d85 (diff) | |
| download | linux-stable-edf81438799ccead7122948446d7e44b083e788d.tar.gz linux-stable-edf81438799ccead7122948446d7e44b083e788d.tar.bz2 linux-stable-edf81438799ccead7122948446d7e44b083e788d.zip | |
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: 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>
Diffstat (limited to 'io_uring')
| -rw-r--r-- | io_uring/net.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/io_uring/net.c b/io_uring/net.c index 8c7226b5bf41..26ff3675214d 100644 --- a/io_uring/net.c +++ b/io_uring/net.c @@ -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; |