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

[Phillip Potter]

On Thu, Apr 01, 2021 at 11:55:50AM +0200, Geert Uytterhoeven wrote:
> 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

Dear Geert

Thank you for your review :-)

Regards,
Phil