[Spice-devel] [PATCH spice-server] red-parse-qxl: Reset mask attributes if brush image is missing

[Frediano Ziglio]

ping 2

> 
> ping
> 
> > 
> > The attributes in this case are not used to apply the mask.
> > Doing so avoid sending garbage from the guest which usually
> > don't initialise the memory in case the mask is missing.
> > Guest should have cleared these bytes by its own however doing so
> > on the server fixes the problem too. Considering that these
> > command should not appears in newer OSes it's surely not a hot path
> > code.
> > These garbage came from video memory of the guest so they don't
> > contain sensitive data.
> > 
> > This fixes https://gitlab.freedesktop.org/spice/spice-server/issues/25.
> > 
> > Signed-off-by: Frediano Ziglio <fziglio at redhat.com>
> > ---
> >  server/red-parse-qxl.c | 10 ++++++++--
> >  1 file changed, 8 insertions(+), 2 deletions(-)
> > 
> > diff --git a/server/red-parse-qxl.c b/server/red-parse-qxl.c
> > index afae94316..a4ac6a473 100644
> > --- a/server/red-parse-qxl.c
> > +++ b/server/red-parse-qxl.c
> > @@ -626,9 +626,15 @@ static void red_put_brush(SpiceBrush *red)
> >  static void red_get_qmask_ptr(RedMemSlotInfo *slots, int group_id,
> >                                SpiceQMask *red, QXLQMask *qxl, uint32_t
> >                                flags)
> >  {
> > -    red->flags  = qxl->flags;
> > -    red_get_point_ptr(&red->pos, &qxl->pos);
> >      red->bitmap = red_get_image(slots, group_id, qxl->bitmap, flags,
> >      true);
> > +    if (red->bitmap) {
> > +        red->flags  = qxl->flags;
> > +        red_get_point_ptr(&red->pos, &qxl->pos);
> > +    } else {
> > +        red->flags  = 0;
> > +        red->pos.x = 0;
> > +        red->pos.y = 0;
> > +    }
> >  }
> >  
> >  static void red_put_qmask(SpiceQMask *red)