From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

MSG_CMSG_CLOEXEC cleans up received fd's; it's really only for Unix
sockets, but currently we enable it for everything; some socket types
(IP_MPTCP) don't like this.

Only enable it when we're giving the recvmsg room to receive fd's
anyway.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 io/channel-socket.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/io/channel-socket.c b/io/channel-socket.c
index de259f7eed..606ec97cf7 100644
--- a/io/channel-socket.c
+++ b/io/channel-socket.c
@@ -487,15 +487,15 @@ static ssize_t qio_channel_socket_readv(QIOChannel *ioc,
 
     memset(control, 0, CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS));
 
-#ifdef MSG_CMSG_CLOEXEC
-    sflags |= MSG_CMSG_CLOEXEC;
-#endif
-
     msg.msg_iov = (struct iovec *)iov;
     msg.msg_iovlen = niov;
     if (fds && nfds) {
         msg.msg_control = control;
         msg.msg_controllen = sizeof(control);
+#ifdef MSG_CMSG_CLOEXEC
+        sflags |= MSG_CMSG_CLOEXEC;
+#endif
+
     }
 
  retry:
-- 
2.31.1

On Thu, Apr 08, 2021 at 08:11:55PM +0100, Dr. David Alan Gilbert (git) wrote:
> From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> 
> MSG_CMSG_CLOEXEC cleans up received fd's; it's really only for Unix
> sockets, but currently we enable it for everything; some socket types
> (IP_MPTCP) don't like this.
> 
> Only enable it when we're giving the recvmsg room to receive fd's
> anyway.
> 
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> ---
>  io/channel-socket.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Regards,
Daniel
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