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

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Date:   Wed, 22 May 2019 12:41:30 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Fabio Lima <fabiolima39@...il.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

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