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authorPavel Begunkov <asml.silence@gmail.com>2022-10-21 11:16:40 +0100
committerJens Axboe <axboe@kernel.dk>2022-10-22 08:43:03 -0600
commitedf81438799ccead7122948446d7e44b083e788d (patch)
treec4d5c3ce1ed31c57c03947566bccd2d33e18f55e /io_uring
parente993ffe3da4bcddea0536b03be1031bf35cd8d85 (diff)
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.c2
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;