[PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c

[Geert Uytterhoeven]

On Thu, Apr 1, 2021 at 12:09 AM Phillip Potter <phil at philpotter.co.uk> wrote:
> Use kzalloc() rather than kmalloc() for the dynamically allocated parts
> of the colormap in fb_alloc_cmap_gfp, to prevent a leak of random kernel
> data to userspace under certain circumstances.
>
> Fixes a KMSAN-found infoleak bug reported by syzbot at:
> https://syzkaller.appspot.com/bug?id=741578659feabd108ad9e06696f0c1f2e69c4b6e
>
> Reported-by: syzbot+47fa9c9c648b765305b9 at syzkaller.appspotmail.com
> Signed-off-by: Phillip Potter <phil at philpotter.co.uk>

Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>

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