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

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Date:   Thu, 2 Sep 2021 19:22:38 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        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 Thu, Sep 2, 2021 at 7:15 PM Hans Verkuil <hverkuil@...all.nl> wrote:
>
> 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 :-)

Oh, I see. If that patch is already merged, please remark my patch as Obsoleted.

Curiously, I did not get an email notification to mark my patch as
Obsoleted before. Why?

>
> 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
>