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

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Message-ID: <YGc6M4jao4ZbCqzJ@kroah.com>
Date:   Fri, 2 Apr 2021 17:37:23 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Phillip Potter <phil@...lpotter.co.uk>
Cc:     mchehab+huawei@...nel.org, daniel.vetter@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] zero-fill colormap in drivers/video/fbdev/core/fbcmap.c

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@...kaller.appspotmail.com
> Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
> ---
>  drivers/video/fbdev/core/fbcmap.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)

Daniel, want me to take this?

thanks,

greg k-h