linux-kernel - Re: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer overflow in pxa3xx_gcu

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Message-ID: <YyjsKkg+qG5ieCAC@sashalap>
Date:   Mon, 19 Sep 2022 18:24:42 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Vitaly Chikunov <vt@...linux.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 5.15 22/41] video: fbdev: pxa3xx-gcu: Fix integer
 overflow in pxa3xx_gcu_write

On Mon, Sep 19, 2022 at 11:21:43AM +0300, Vitaly Chikunov wrote:
>On Mon, Jun 27, 2022 at 10:20:41PM -0400, Sasha Levin wrote:
>> From: Hyunwoo Kim <imv4bel@...il.com>
>>
>> [ Upstream commit a09d2d00af53b43c6f11e6ab3cb58443c2cac8a7 ]
>>
>> In pxa3xx_gcu_write, a count parameter of type size_t is passed to words of
>> type int.  Then, copy_from_user() may cause a heap overflow because it is used
>> as the third argument of copy_from_user().
>
>Why this commit is still not in the stable branches?

Mostly because it's not tagged for stable.

But really, looks like I've missed a batch a few months ago, I can push
it for the next release cycle.

>Isn't this is the fix for CVE-2022-39842[1]?

How the heck did this thing get a CVE?

-- 
Thanks,
Sasha