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

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Date:   Thu, 2 Sep 2021 19:10:02 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     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 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

> >
> > > > > > 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