linux-kernel - Re: [PATCH v1] staging: r8188eu: an incorrect return value made the function always return fail

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Message-ID: <CAEth8oGg3U27fHpnvtHXsT8GLsfxk3ZNshGLN5e4P_5Ksx7tsA@mail.gmail.com>
Date:   Mon, 20 Jun 2022 17:37:09 +0800
From:   Kate Hsuan <hpa@...hat.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michael Straube <straube.linux@...il.com>,
        "Fabio M . De Francesco" <fmdefrancesco@...il.com>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] staging: r8188eu: an incorrect return value made the
 function always return fail

On Mon, Jun 20, 2022 at 5:02 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi Kate,
>
> Good catch!
>
> On 6/20/22 10:54, Kate Hsuan wrote:
> > Since _SUCCESS (1) and _FAIL (0) are used to indicate the status of the
> > functions. The previous commit 8ae7bf782eacad803f752c83a183393b0a67127b
>
> This is the commit hash from one of the stable series backports, you
> should always use the commit hash from Linus' master branch which is
> f94b47c6bde6 and the format for referencing commits in a commit-message is:
>
> commit <12 char hash> ("commit subject")
>
> so in this case this should have been:
>
> commit f94b47c6bde6 ("staging: r8188eu: add check for kzalloc")
>
> Note that checkpatch.pl would have complained about the wrong format
> (but not the wrong hash)

Thanks for this. I'll improve my commit message.

>
> > fixed and prevented dereferencing a NULL pointer through checking the
> > return pointer. The NULL pointer check work properly but the return
> > values (-ENOMEM on fail and 0 on success). This work fixed the return
> > values to make sure the caller function will return the correct status.
> >
> > BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=2097526
> > Signed-off-by: Kate Hsuan <hpa@...hat.com>
>
> This should have a fixes tag:
>
> Fixes: f94b47c6bde6 ("staging: r8188eu: add check for kzalloc")
>
> But while looking up the torvalds/master branch hash I noticed
> someone alreayd beat you to it. Linus' master already has
> a fix for this:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/staging/r8188eu?id=5b7419ae1d208cab1e2826d473d8dab045aa75c7
>
> So this patch can be dropped since it is a duplicate.

Ah~ I have to check before starting to fix it.

Thank you :)

>
> Regards,
>
> hans
>
>
>
> > ---
> >  drivers/staging/r8188eu/core/rtw_xmit.c | 8 +++-----
> >  1 file changed, 3 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/staging/r8188eu/core/rtw_xmit.c b/drivers/staging/r8188eu/core/rtw_xmit.c
> > index f4e9f6102539..2f8720db21d9 100644
> > --- a/drivers/staging/r8188eu/core/rtw_xmit.c
> > +++ b/drivers/staging/r8188eu/core/rtw_xmit.c
> > @@ -180,10 +180,8 @@ s32      _rtw_init_xmit_priv(struct xmit_priv *pxmitpriv, struct adapter *padapter)
> >       pxmitpriv->free_xmit_extbuf_cnt = num_xmit_extbuf;
> >
> >       res = rtw_alloc_hwxmits(padapter);
> > -     if (res) {
> > -             res = _FAIL;
> > +     if (res == _FAIL)
> >               goto exit;
> > -     }
> >
> >       rtw_init_hwxmits(pxmitpriv->hwxmits, pxmitpriv->hwxmit_entry);
> >
> > @@ -1510,7 +1508,7 @@ int rtw_alloc_hwxmits(struct adapter *padapter)
> >
> >       pxmitpriv->hwxmits = kzalloc(sizeof(struct hw_xmit) * pxmitpriv->hwxmit_entry, GFP_KERNEL);
> >       if (!pxmitpriv->hwxmits)
> > -             return -ENOMEM;
> > +             return _FAIL;
> >
> >       hwxmits = pxmitpriv->hwxmits;
> >
> > @@ -1528,7 +1526,7 @@ int rtw_alloc_hwxmits(struct adapter *padapter)
> >       } else {
> >       }
> >
> > -     return 0;
> > +     return _SUCCESS;
> >  }
> >
> >  void rtw_free_hwxmits(struct adapter *padapter)
>


-- 
BR,
Kate