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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 23 Oct 2014 10:08:22 +0200
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Subject: Re: [Qemu-devel] [PATCH 0/3] vnc: trivial problem and memory leak
	fix
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To: arei.gonglei@huawei.com
Cc: weidong.huang@huawei.com, qemu-devel@nongnu.org, peter.huangpeng@huawei.com

On Do, 2014-10-23 at 13:39 +0800, arei.gonglei@huawei.com wrote:
> From: Gonglei <arei.gonglei@huawei.com>
> 
> Beside those problems, I also found another issue, see below pls.
> 
> Qemu command line:
> $ ./qemu-system-x86_64 -enable-kvm -m 4096 -smp 4 -name redhat6.2 -drive file=/home/redhat.img,if=none,id=drive-ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 -drive file=/mnt/sdb/gonglei/iso/rhel-server-7.0-x86_64-dvd.iso,if=none,id=drive-ide0-0-1 -device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1,bootindex=4 -qmp unix:/tmp/qmp,server,nowait -monitor stdio -vnc 0.0.0.0:10,password,sasl
> QEMU 2.1.50 monitor - type 'help' for more information
> (qemu) change vnc password 123
> (qemu) change vnc abc
> error parsing address 'abc'     ---> an intended result because of I set a invalid value 'abc'
> (qemu) change vnc password 456
> If you want use passwords please enable password auth using '-vnc ${dpy},password'.Could not set password  --> Oops. I shouldn't get this output.
> (qemu) 
> 
> 
> Though we call qmp_change_vnc() failed, the content of global variable vnc_display
> still will change, such as 'vs->auth = VNC_AUTH_NONE' now. I think this is not
> reasonable, but I have not good idea to address this issue.

I think the current behavior is fine.  Better be on the safe side (no
connects possible) in case "change vnc $display" failed.  You can fix
that using "change vnc 0.0.0.0:10,password,sasl"

cheers,
  Gerd