linux-kernel - Re: [PATCH v2] staging: rtl8192e: Replace strcpy with strcat in rtl819x_translate

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Message-ID: <ZsoT3eQq6muDPh5Z@embed-PC.myguest.virtualbox.org>
Date: Sat, 24 Aug 2024 22:39:49 +0530
From: Abhishek Tamboli <abhishektamboli9@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: gregkh@...uxfoundation.org, tdavies@...kphysics.net,
	philipp.g.hortmann@...il.com, garyrookard@...tmail.org,
	linux-staging@...ts.linux.dev, skhan@...uxfoundation.org,
	rbmarliere@...il.com, christophe.jaillet@...adoo.fr,
	linux-kernel-mentees@...ts.linuxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: rtl8192e: Replace strcpy with strcat in
 rtl819x_translate_scan

On Sat, Aug 24, 2024 at 02:21:47PM +0300, Dan Carpenter wrote:
> On Fri, Aug 23, 2024 at 09:04:11PM +0530, Abhishek Tamboli wrote:
> > diff --git a/drivers/staging/rtl8192e/rtllib_wx.c b/drivers/staging/rtl8192e/rtllib_wx.c
> > index fbd4ec824084..ec0c4c5bade7 100644
> > --- a/drivers/staging/rtl8192e/rtllib_wx.c
> > +++ b/drivers/staging/rtl8192e/rtllib_wx.c
> > @@ -23,14 +23,14 @@ static const char * const rtllib_modes[] = {
> >  };
> > 
> >  #define MAX_CUSTOM_LEN 64
> > +#define MAX_PROTO_NAME_LEN 10
> >  static inline char *rtl819x_translate_scan(struct rtllib_device *ieee,
> >  					   char *start, char *stop,
> >  					   struct rtllib_network *network,
> >  					   struct iw_request_info *info)
> >  {
> >  	char custom[MAX_CUSTOM_LEN];
> > -	char proto_name[6];
> > -	char *pname = proto_name;
> > +	char proto_name[MAX_PROTO_NAME_LEN];
> 
> In the end I think we don't want to make this buffer larger.  But if we did
> this define is really vague and slightly confusing.  I assumed it was something
> else when I read it.  It hurts readability.  It would probably be better to just
> leave it as 6 instead and add a comment.  /* Large enough to hold "N-24G" */
Okay, I'll revert the buffer size to 6.
> 
> >  	char *p;
> >  	struct iw_event iwe;
> >  	int i, j;
> > @@ -59,13 +59,12 @@ static inline char *rtl819x_translate_scan(struct rtllib_device *ieee,
> >  	}
> >  	/* Add the protocol name */
> >  	iwe.cmd = SIOCGIWNAME;
> > +	/* Initialise proto_name as an empty string*/
> 
> This comment doesn't add any information.  Every kernel developer knows what
> memset() does.
Sure, I'll remove it.
> > +	memset(proto_name, '\0', sizeof(proto_name));
> 
> Normally we would just say 0 instead of '\0'.  The other way to do this would
> be to initialize it at the start:
> 
> 	char proto_name[6] = "";
> 
Thanks, for the feedback. I'll do the changes.

Regards,
Abhishek