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libvhost-user: set msg.msg_control to NULL when it is empty

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On some OS (e.g. macOS) sendmsg() returns -1 (errno EINVAL) if
the `struct msghdr` has the field `msg_controllen` set to 0, but
`msg_control` is not NULL.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20240618100043.144657-3-sgarzare@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefano Garzarella 2024-06-18 12:00:32 +02:00 committed by Michael S. Tsirkin
parent 0aa7f10c7a
commit 516dfbb783
1 changed files with 1 additions and 0 deletions
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subprojects/libvhost-user/libvhost-user.c
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@ -632,6 +632,7 @@ vu_message_write(VuDev *dev, int conn_fd, VhostUserMsg *vmsg)
memcpy(CMSG_DATA(cmsg), vmsg->fds, fdsize);
} else {
msg.msg_controllen = 0;
msg.msg_control = NULL;
}
do {