linux-kernel - Re: [PATCH] driver: r8188eu: remove NULL check before vfree

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Message-ID: <CAD-N9QUpBHgtu8kssuf-22n94RnLDshioDaJTcFWNipvAuh08g@mail.gmail.com>
Date:   Tue, 14 Jun 2022 17:21:10 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>,
        Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Martin Kaiser <martin@...ser.cx>,
        Michael Straube <straube.linux@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        linux-staging@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] driver: r8188eu: remove NULL check before vfree

On Tue, Jun 14, 2022 at 5:18 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Tue, Jun 14, 2022 at 05:03:30PM +0800, Dongliang Mu wrote:
> > From: mudongliang <mudongliangabcd@...il.com>
> >
> > vfree can handle NULL pointer as its argument.
> > According to coccinelle isnullfree check, remove NULL check
> > before vfree operation.
> >
> > Signed-off-by: mudongliang <mudongliangabcd@...il.com>
> > ---
> >  drivers/staging/r8188eu/os_dep/usb_intf.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/staging/r8188eu/os_dep/usb_intf.c b/drivers/staging/r8188eu/os_dep/usb_intf.c
> > index 68869c5daeff..bd1c8b4b5c4b 100644
> > --- a/drivers/staging/r8188eu/os_dep/usb_intf.c
> > +++ b/drivers/staging/r8188eu/os_dep/usb_intf.c
> > @@ -372,8 +372,7 @@ static struct adapter *rtw_usb_if1_init(struct dvobj_priv *dvobj,
> >  free_adapter:
> >       if (pnetdev)
> >               rtw_free_netdev(pnetdev);
> > -     else if (padapter)
> > -             vfree(padapter);
> > +     vfree(padapter);
>
> You changed the logic of this code here, please be more careful in the
> future.

Oh yes, I will move vfree into the else branch. Sorry for the mistake.

>
> Also, you need to use your real name for the signed-off-by and From:
> line.

Sure.

>
> thanks,
>
> greg k-h