linux-kernel - Re: [PATCH] fbdev: smscufx: properly copy ioctl memory to kernelspace

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Message-ID: <cf7dcdf8-6b81-4e80-b358-f20b2f0f576c@gmx.de>
Date: Tue, 30 Dec 2025 09:38:21 +0100
From: Helge Deller <deller@....de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, Tianchu Chen <flynnnchen@...cent.com>,
 stable <stable@...nel.org>, Steve Glendinning <steve.glendinning@...well.net>
Subject: Re: [PATCH] fbdev: smscufx: properly copy ioctl memory to kernelspace

On 12/28/25 14:17, Greg Kroah-Hartman wrote:
> The UFX_IOCTL_REPORT_DAMAGE ioctl does not properly copy data from
> userspace to kernelspace, and instead directly references the memory,
> which can cause problems if invalid data is passed from userspace.  Fix
> this all up by correctly copying the memory before accessing it within
> the kernel.
> 
> Reported-by: Tianchu Chen <flynnnchen@...cent.com>
> Cc: stable <stable@...nel.org>
> Cc: Steve Glendinning <steve.glendinning@...well.net>
> Cc: Helge Deller <deller@....de>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>   drivers/video/fbdev/smscufx.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)

applied to fbdev git tree.

Thanks!
Helge