linux-kernel - Re: [PATCH] media: usb: fix memory leak in stk_camera

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Message-ID: <2c3e496a-fdc7-020b-4234-58441e766f7d@xs4all.nl>
Date:   Thu, 2 Sep 2021 13:15:50 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Dongliang Mu <mudongliangabcd@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>, linux-media@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Pavel Skripkin <paskripkin@...il.com>
Subject: Re: [PATCH] media: usb: fix memory leak in stk_camera_probe

On 02/09/2021 13:10, Dongliang Mu wrote:
> On Thu, Sep 2, 2021 at 6:59 PM Dongliang Mu <mudongliangabcd@...il.com> wrote:
>>
>> On Thu, Sep 2, 2021 at 6:54 PM Mauro Carvalho Chehab <mchehab@...nel.org> wrote:
>>>
>>> Em Thu, 2 Sep 2021 12:39:37 +0200
>>> Greg KH <gregkh@...uxfoundation.org> escreveu:
>>>
>>>> On Thu, Sep 02, 2021 at 06:23:36PM +0800, Dongliang Mu wrote:
>>>>> On Fri, Jul 23, 2021 at 6:11 PM Dongliang Mu <mudongliangabcd@...il.com> wrote:
>>>>>>
>>>>>> On Wed, Jul 14, 2021 at 11:23 AM Dongliang Mu <mudongliangabcd@...il.com> wrote:
>>>>>>>
>>>>>>> stk_camera_probe mistakenly execute usb_get_intf and increase the
>>>>>>> refcount of interface->dev.
>>>>>>>
>>>>>>> Fix this by removing the execution of usb_get_intf.
>>>>>>
>>>>>> Any idea about this patch?
>>>>>
>>>>> +cc Dan Carpenter, gregkh
>>>>>
>>>>> There is no reply in this thread in one month. Can someone give some
>>>>> feedback on this patch?
>>>>
>>>> This is the media developers domain, not much I can do here.
>>>
>>> There is a high volume of patches for the media subsystem. Anyway,
>>> as your patch is at our patchwork instance:
>>>
>>>         https://patchwork.linuxtv.org/project/linux-media/patch/20210714032340.504836-1-mudongliangabcd@gmail.com/
>>>
>>> It should be properly tracked, and likely handled after the end of
>>> the merge window.
> 
> Hi Mauro,
> 
> I found there is another fix [1] for the same memory leak from Pavel
> Skripkin (already cc-ed in this thread).
> 
> [1] https://www.spinics.net/lists/stable/msg479628.html

Ah, that's why I marked it as Obsoleted :-)

Regards,

	Hans

> 
>>>
>>>>>>> Reported-by: Dongliang Mu <mudongliangabcd@...il.com>
>>>>>>> Fixes: 0aa77f6c2954 ("[media] move the remaining USB drivers to drivers/media/usb")
>>>>>>> Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
>>>
>>> If you're the author of the patch, it doesn't make much sense to
>>> add a "Reported-by:" tag there. We only use it in order to give
>>> someone's else credit to report an issue.
>>
>> I see. Someone told me this rule in another thread. I will update this
>> in the next version.
>>
>>>
>>> Thanks,
>>> Mauro