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

[Philipp Hortmann]

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@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-staging@xxxxxxxxxxxxxxx
> Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
> ---
> 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

>