linux-kernel - Re: [PATCH v2] staging: rtl8192e: remove bogus ssid character sign test

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Date:   Tue, 25 Oct 2022 19:35:08 +0200
From:   Philipp Hortmann <philipp.g.hortmann@...il.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        dan.carpenter@...cle.com, gregkh@...uxfoundation.org,
        kvalo@...nel.org, linux-wireless@...r.kernel.org
Subject: Re: [PATCH v2] staging: rtl8192e: remove bogus ssid character sign
 test

On 10/25/22 14:21, Jason A. Donenfeld wrote:
> This error triggers on some architectures with unsigned `char` types:
> 
> drivers/staging/rtl8192e/rtllib_softmac_wx.c:459 rtllib_wx_set_essid() warn: impossible condition '(extra[i] < 0) => (0-255 < 0)'
> 
> But actually, the entire test is bogus, as ssids don't have any sign
> validity rules like that. So just remove this check look all together.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-staging@...ts.linux.dev
> Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
> ---
> Changes v1->v2:
> - Remove ssid sign test entirely rather than casting to `s8 *`.
> 
>   drivers/staging/rtl8192e/rtllib_softmac_wx.c | 9 +--------
>   1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_softmac_wx.c b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> index f9589c5b62ba..1e5ad3b476ef 100644
> --- a/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> +++ b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
> @@ -439,7 +439,7 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
>   			union iwreq_data *wrqu, char *extra)
>   {
>   
> -	int ret = 0, len, i;
> +	int ret = 0, len;
>   	short proto_started;
>   	unsigned long flags;
>   
> @@ -455,13 +455,6 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
>   		goto out;
>   	}
>   
> -	for (i = 0; i < len; i++) {
> -		if (extra[i] < 0) {
> -			ret = -1;
> -			goto out;
> -		}
> -	}
> -
>   	if (proto_started)
>   		rtllib_stop_protocol(ieee, true);

This patch cannot be applied on:
[PATCH] staging: rtl8192e: use explicitly signed char
On 10/24/22 18:30, Jason A. Donenfeld
As line 456 was changed.

Bye Philipp

>