Re: [Qemu-devel] [PATCH] ui/vnc.c: Fix crash with VNC

[Michael Tokarev <mjt@tls.msk.ru>]

On 09.11.2012 13:00, Michael Tokarev wrote:
> On 09.11.2012 03:55, BALATON Zoltan wrote:
>> On Thu, 8 Nov 2012, Gerd Hoffmann wrote:
>>>> I think this is fixing this at the wrong level. Either we
>>>> should require that drivers (in this case vmware_vga.c)
>>>> must not call dpy_gfx_update() with out of range values,
>>>> or we should do the clipping in the console.c layer, but
>>>> I don't think requiring every UI backend to clip is the
>>>> right thing. Anthony?
>>>
>>> Agree.  IMHO vmware_vga.c is at fault here and should be fixed.  We can
>>> add some asserts to console.[ch] to enforce this ...
>>
>> Would the attached patch help?
> 
> I fixed this 2 times, and I remember two other people fixing
> the same thing too already.  Lemme find some refs...
> 
> http://thread.gmane.org/gmane.comp.emulators.qemu/166064
> 
> ---
> Is it the same as https://bugs.launchpad.net/bugs/918791 ?
> At least it appears to be the same theme...  But there,
> the patch (https://launchpadlibrarian.net/94916786/qemu-vmware.debdiff)
> also updates width/height.  My comment:
> https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/918791/comments/21
> ---

Another reference: the same problem in qxl (Gerd should know this area):

 http://thread.gmane.org/gmane.comp.emulators.qemu/171093

this patch is a cleanup, -- the problem has been fixed twice in a row in qxl.
We've 3 fixes for it in vmware now too.

So figuring out the proper level where to fix it is important...

/mjt