linux-kernel - Re: [PATCH] staging: rtl8723bs: Add missing blank lines

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Message-ID: <CAAM19CGt1UoAXgQWoO85k7UQ8r3rBx6S7-po1aC5OfQZbcO55Q@mail.gmail.com>
Date:   Tue, 28 May 2019 21:18:47 -0300
From:   Fabio Lima <fabiolima39@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     gregkh@...uxfoundation.org, jeremy@...zel.net,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        lkcamp@...ts.libreplanetbr.org
Subject: Re: [PATCH] staging: rtl8723bs: Add missing blank lines

Em qua, 22 de mai de 2019 06:41, Dan Carpenter
<dan.carpenter@...cle.com> escreveu:
>
> On Tue, May 21, 2019 at 09:46:55PM -0300, Fabio Lima wrote:
> > This patch resolves the following warning from checkpatch.pl
> > WARNING: Missing a blank line after declarations
> >
> > Signed-off-by: Fabio Lima <fabiolima39@...il.com>
> > ---
> >  drivers/staging/rtl8723bs/core/rtw_debug.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/staging/rtl8723bs/core/rtw_debug.c b/drivers/staging/rtl8723bs/core/rtw_debug.c
> > index 9f8446ccf..853362381 100644
> > --- a/drivers/staging/rtl8723bs/core/rtw_debug.c
> > +++ b/drivers/staging/rtl8723bs/core/rtw_debug.c
> > @@ -382,6 +382,7 @@ ssize_t proc_set_roam_tgt_addr(struct file *file, const char __user *buffer, siz
> >       if (buffer && !copy_from_user(tmp, buffer, sizeof(tmp))) {
> >
> >               int num = sscanf(tmp, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", addr, addr+1, addr+2, addr+3, addr+4, addr+5);
> > +
> >               if (num == 6)
> >                       memcpy(adapter->mlmepriv.roam_tgt_addr, addr, ETH_ALEN);
> >
>
> I'm sorry but this function is really such nonsense.  Can you send a
> patch to re-write it instead?
>
> drivers/staging/rtl8723bs/core/rtw_debug.c
>    371  ssize_t proc_set_roam_tgt_addr(struct file *file, const char __user *buffer, size_t count, loff_t *pos, void *data)
>    372  {
>    373          struct net_device *dev = data;
>    374          struct adapter *adapter = (struct adapter *)rtw_netdev_priv(dev);
>    375
>    376          char tmp[32];
>    377          u8 addr[ETH_ALEN];
>    378
>    379          if (count < 1)
>
> This check is silly.  I guess the safest thing is to change it to:
>                 if (count < sizeof(tmp))
>
>    380                  return -EFAULT;
>
> It should be return -EINVAL;
>
>    381
>    382          if (buffer && !copy_from_user(tmp, buffer, sizeof(tmp))) {
>
> Remove the check for if the user passes a NULL buffer, because that's
> already handled in copy_from_user().  Return -EFAULT if copy_from_user()
> fails.
>
>         if (copy_from_user(tmp, buffer, sizeof(tmp)))
>                 return -EFAULT;
>
>
>    383
>
> Extra blank line.
>
>    384                  int num = sscanf(tmp, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", addr, addr+1, addr+2, addr+3, addr+4, addr+5);
>
> You will need to move the num declaration to the start of the function.
>
>    385                  if (num == 6)
>    386                          memcpy(adapter->mlmepriv.roam_tgt_addr, addr, ETH_ALEN);
>
> If num != 6 then return -EINVAL;
>
>    387
>    388                  DBG_871X("set roam_tgt_addr to "MAC_FMT"\n", MAC_ARG(adapter->mlmepriv.roam_tgt_addr));
>    389          }
>    390
>    391          return count;
>    392  }
>
> regards,
> dan carpenter

Thanks for your feedback.
This is my first patch and I will send the second patch with
modifications that you suggest.

Fabio Lima