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io_uring/net: clear msg_controllen on partial sendmsg retry

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Commit b1dc492087db0f2e5a45f1072a743d04618dd6be upstream.

If we have cmsg attached AND we transferred partial data at least, clear
msg_controllen on retry so we don't attempt to send that again.

Cc: stable@vger.kernel.org # 5.10+
Fixes: cac9e4418f4c ("io_uring/net: save msghdr->msg_control for retries")
Reported-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-06-23 07:39:42 -06:00 committed by Greg Kroah-Hartman
parent 5fdea4468f
commit 826ee9fa36
1 changed files with 2 additions and 0 deletions
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io_uring/io_uring.c
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@ -5064,6 +5064,8 @@ static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
if (ret == -ERESTARTSYS)
ret = -EINTR;
if (ret > 0 && io_net_retry(sock, flags)) {
kmsg->msg.msg_controllen = 0;
kmsg->msg.msg_control = NULL;
sr->done_io += ret;
req->flags |= REQ_F_PARTIAL_IO;
return io_setup_async_msg(req, kmsg);