linux-kernel - Re: [PATCH] staging: wlan-ng: replace rate macros

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Date:   Sat, 15 Apr 2023 15:43:20 +0300
From:   Dan Carpenter <error27@...il.com>
To:     Luke Koch <lu.ale.koch@...il.com>
Cc:     gregkh@...uxfoundation.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wlan-ng: replace rate macros

On Sat, Apr 15, 2023 at 01:28:47PM +0200, Luke Koch wrote:
> Change p80211msg_dot11req_scan_results rate members to struct arrays
> instead of individually numbered member structs.
> Replace macros to set rates with loops to avoid checkpatch warning
> and adhere to linux coding style.

Writing every sentence in imperative tense makes people sound like space
aliens in human skin...  You can if you want to but it's not a
requirement in staging.  There are two maintainers who have that
requirement and the Outreachy people.

> 
> Reported by checkpatch:
> 
> CHECK: Macro argument reuse 'N' - possible side-effects?
> 
> Signed off by: Luke Koch <lu.ale.koch@...il.com>
> ---
>  drivers/staging/wlan-ng/p80211metastruct.h | 18 +-------
>  drivers/staging/wlan-ng/prism2mgmt.c       | 52 +++++++---------------
>  2 files changed, 18 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/staging/wlan-ng/p80211metastruct.h b/drivers/staging/wlan-ng/p80211metastruct.h
> index 4adc64580185..e963227f797c 100644
> --- a/drivers/staging/wlan-ng/p80211metastruct.h
> +++ b/drivers/staging/wlan-ng/p80211metastruct.h
> @@ -114,22 +114,8 @@ struct p80211msg_dot11req_scan_results {
>  	struct p80211item_uint32 cfpollreq;
>  	struct p80211item_uint32 privacy;
>  	struct p80211item_uint32 capinfo;
> -	struct p80211item_uint32 basicrate1;
                                 ^^^^^^^^^^
This starts at 1 instead of 0.

> -	struct p80211item_uint32 basicrate2;
> -	struct p80211item_uint32 basicrate3;
> -	struct p80211item_uint32 basicrate4;
> -	struct p80211item_uint32 basicrate5;
> -	struct p80211item_uint32 basicrate6;
> -	struct p80211item_uint32 basicrate7;
> -	struct p80211item_uint32 basicrate8;
> -	struct p80211item_uint32 supprate1;
> -	struct p80211item_uint32 supprate2;
> -	struct p80211item_uint32 supprate3;
> -	struct p80211item_uint32 supprate4;
> -	struct p80211item_uint32 supprate5;
> -	struct p80211item_uint32 supprate6;
> -	struct p80211item_uint32 supprate7;
> -	struct p80211item_uint32 supprate8;
> +	struct p80211item_uint32 basicrate[8];
> +	struct p80211item_uint32 supprate[8];
>  } __packed;
> 
>  struct p80211msg_dot11req_start {
> diff --git a/drivers/staging/wlan-ng/prism2mgmt.c b/drivers/staging/wlan-ng/prism2mgmt.c
> index 9030a8939a9b..069c39c36753 100644
> --- a/drivers/staging/wlan-ng/prism2mgmt.c
> +++ b/drivers/staging/wlan-ng/prism2mgmt.c
> @@ -437,42 +437,22 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
>  		if (item->supprates[count] == 0)
>  			break;
> 
> -#define REQBASICRATE(N) \
> -	do { \
> -		if ((count >= (N)) && DOT11_RATE5_ISBASIC_GET(	\
> -			item->supprates[(N) - 1])) { \
> -			req->basicrate ## N .data = item->supprates[(N) - 1]; \
> -			req->basicrate ## N .status = \
> -				P80211ENUM_msgitem_status_data_ok; \
> -		} \
> -	} while (0)
> -
> -	REQBASICRATE(1);
> -	REQBASICRATE(2);
> -	REQBASICRATE(3);
> -	REQBASICRATE(4);
> -	REQBASICRATE(5);
> -	REQBASICRATE(6);
> -	REQBASICRATE(7);
> -	REQBASICRATE(8);
> -
> -#define REQSUPPRATE(N) \
> -	do { \
> -		if (count >= (N)) {					\
> -			req->supprate ## N .data = item->supprates[(N) - 1]; \
> -			req->supprate ## N .status = \
> -				P80211ENUM_msgitem_status_data_ok; \
> -		} \
> -	} while (0)
> -
> -	REQSUPPRATE(1);
> -	REQSUPPRATE(2);
> -	REQSUPPRATE(3);
> -	REQSUPPRATE(4);
> -	REQSUPPRATE(5);
> -	REQSUPPRATE(6);
> -	REQSUPPRATE(7);
> -	REQSUPPRATE(8);
> +	for (int i = 0; i < 8; i++) {
                 ^^^^^
Now it starts at zero.

> +		if (count >= i &&
> +		    DOT11_RATE5_ISBASIC_GET(item->supprates[i - 1])) {
                                                            ^^^^^
This is an array underflow.

regards,
dan carpenter

> +			req->basicrate[i] .data = item->supprates[i - 1];
> +			req->basicrate[i] .status =
> +				P80211ENUM_msgitem_status_data_ok;
> +		}
> +	}
> +
> +	for (int i = 0; i < 8; i++) {
> +		if (count >= i) {
> +			req->supprate[i] .data = item->supprates[i - 1];
> +			req->supprate[i] .status =
> +				P80211ENUM_msgitem_status_data_ok;
> +		}
> +	}
>  
>  	/* beacon period */
>  	req->beaconperiod.status = P80211ENUM_msgitem_status_data_ok;
> -- 
> 2.34.1
>