Vnc: fix auth error with vnc clients <= 3.7kvm-49

Don't send SecurityResult when communicating with vnc clients of v3.7
with AUTH_NONE.

Signed-off-by: Dan Kenigsberg <danken@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/vnc.c b/vnc.c
index 2b0b3b655..b823d86ce 100644
--- a/vnc.c
+++ b/vnc.c
@@ -1781,7 +1781,10 @@ static int protocol_client_auth(VncState *vs, char *data, size_t len)
        switch (vs->auth) {
        case VNC_AUTH_NONE:
            VNC_DEBUG("Accept auth none\n");
-           vnc_write_u32(vs, 0); /* Accept auth completion */
+           if (vs->minor >= 8) {
+               vnc_write_u32(vs, 0); /* Accept auth completion */
+               vnc_flush(vs);
+           }
            vnc_read_when(vs, protocol_client_init, 1);
            break;