[PATCH v2 17/19] fbdev: Validate info->screen_{base,buffer} in fb_ops implementations

[Geert Uytterhoeven]

On Fri, Apr 28, 2023 at 2:26 PM Thomas Zimmermann <tzimmermann at suse.de> wrote:
> Push the test for info->screen_base from fb_read() and fb_write() into
> the implementations of struct fb_ops.{fb_read,fb_write}. In cases where
> the driver operates on info->screen_buffer, test this field instead.
>
> While bothi fields, screen_base and screen_buffer, are stored in the

both

> same location, they refer to different address spaces. For correctness,
> we want to test each field in exactly the code that uses it.

Not a direct comment for this patch: and later the union can be split
in two separate fields, to protect against misuse?

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds