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Date:   Fri, 14 Feb 2020 14:34:49 +0100
From:   Hans Verkuil <>
To:     Hillf Danton <>
Cc:     Laurent Pinchart <>,
        Dan Carpenter <>,
        syzbot <>,
        Alan Stern <>,
        Allison Randal <>,
        Greg Kroah-Hartman <>,
        Souptick Joarder <>,,,,,,,
Subject: Re: [PATCH] media: usbvision: Fix a use after free in v4l2_release()

On 2/14/20 1:48 PM, Hillf Danton wrote:
> On Fri, 14 Feb 2020 13:21:03 +0100 Hans Verkuil wrote:
>> On 2/14/20 1:14 PM, Hillf Danton wrote:
>>> On Fri, 14 Feb 2020 12:30:29 +0100 Hans Verkuil wrote:
>>>> Hillf, if you want your patch to be merged, then make sure it is CC-ed to
>>>> linux-media as well.
>>> Please pick it up if it makes a sense to you and it was sent with
>>> linux-media added on the Cc list as it is known for a while that
>>> my mail agent is rejected for what I am not clear
>>> about. It makes my day occasionally :P
>> I don't I ever received the full patch, only replies to your patch.
> =========
> Please take a look at the Cc tag in the snippet from
>> Subject: [PATCH] media: usbvision: add the release callback for video device
>> From: Hillf Danton <>
>> To fix the UAF syzbot reported,
>> BUG: KASAN: use-after-free in v4l2_release+0x2f1/0x390 drivers/media/v4l2-core/v4l2-dev.c:459
>> a release cb which is a simple wrapper of usbvision_release() is added
>> for releasing resources as the last reference to the usbvision video
>> device goes away.
>> Reported-by: syzbot <>
>> Fixes: 2aa689dd8057 ("[media] usbvision: embed video_device")
>> Cc: Hans Verkuil <>

Ah, my work email. And I always delete posts mailed to that if it is also CC-ed
to linux-media. Which didn't actually arrive there in your case. And it's no longer
in my trash folder either.

So please mail me a properly formatted patch so I can forward it to linux-media
for you.



>> Signed-off-by: Hillf Danton <>
>> ---
> =========
>> Please mail your patch directly to me so I have a clean version.

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