[cairo] [PATCH] fix a crash caused by finished SVG surface

[Bryce W. Harrington]

Looks good to me.  I can commit if no one else has any objections.

Reviewed-by: Bryce Harrington <b.harrington at samsung.com>

On Mon, Oct 28, 2013 at 10:42:47PM +0900, Kouhei Sutou wrote:
> Hi,
> 
> I attach a patch that fix a crash that is caused by finished
> SVG surface. "cairo_create (finished_svg_surface)" is invalid
> usage but it will be better that reporting an error instead
> of crash.
> 
> Here is a program that reproduces this case:
> 
> #include <cairo.h>
> #include <cairo-svg.h>
> 
> int
> main(int argc, char **argv)
> {
>   cairo_t *cr;
>   cairo_surface_t *finished_surface;
> 
>   finished_surface = cairo_svg_surface_create ("/tmp/xxx.svg", 1.0, 1.0);
>   cairo_surface_finish (finished_surface);
> 
>   cr = cairo_create (finished_surface);
>   cairo_destroy (cr);
> 
>   cairo_surface_destroy (finished_surface);
> 
>   return 0;
> }
> 
> We can use other paginated surface such as PDF surface for
> finished surface.
> 
> 
> This case is reported at rcairo's issue:
> https://github.com/rcairo/rcairo/issues/15
> 
> 
> Thanks,
> --
> kou


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