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Date:   Sat, 9 Nov 2019 12:39:43 +0100
From:   Hans Verkuil <>
To:     Greg Kroah-Hartman <>,
        Omer Shalev <>
Cc:     Mauro Carvalho Chehab <>,
        Kate Stewart <>,
        Richard Fontana <>,
        Allison Randal <>,
        Thomas Gleixner <>,,
Subject: Re: [PATCH] media:usb:cpia2: Properly check framebuffer mmap offsets

Hi Greg,

On 11/8/19 9:49 PM, Greg Kroah-Hartman wrote:
> On Fri, Nov 08, 2019 at 09:50:36PM +0000, Omer Shalev wrote:
>> The cpai2 driver's mmap implementation wasn't properly check for all
>> possible offset values. Given a huge offset value , the calculation
>> start_offset + size can wrap around to a low value and pass the check
> I thought we checked that in the core of the kernel now, to keep all
> drivers from not having to do this type of thing (as they obviously all
> forgot to.)  Why is this still needed here as well?

Where is that checked in the core? I couldn't find anything, but I might
have been looking in the wrong place.



> thanks,
> greg k-h

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