Re: [PATCH v2] staging: rtl8192e: Replace strcpy with strcat in rtl819x_translate_scan

[Dan Carpenter <dan.carpenter@linaro.org>]

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" */

>  	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.

> +	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] = "";

regards,
dan carpenter