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

From: Greg KH
Date: Fri Apr 02 2021 - 11:37:29 EST


On Wed, Mar 31, 2021 at 11:07:19PM +0100, Phillip Potter 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> Signed-off-by: Phillip Potter <phil@xxxxxxxxxxxxxxxx>
> ---
> drivers/video/fbdev/core/fbcmap.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)

Daniel, want me to take this?

thanks,

greg k-h