Re: [PATCH V3] staging: rtl8192e: Fix signedness bug in rtllib_rx_assoc_resp()

[Fabio M. De Francesco]

On venerdì 15 aprile 2022 07:50:36 CEST Haowen Bai wrote:
> The rtllib_rx_assoc_resp() function has a signedness bug because it's
> a declared as a u16 but it return -ENOMEM.  When you look at it more
> closely it returns a mix of error codes including 0xcafe, -ENOMEM, and
> a->status which is WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG.  This is a mess.
> 
> Clean it up to just return standard kernel error codes.  We can print
> out the a->status before returning a regular error code.  The printks
> in the caller need to be adjusted as well.

This commit message suggested by Dan Carpenter is much better. The previous 
one made me think that you were doing several different logical changes.

>
> [snip]
>  
>  static void rtllib_rx_auth_resp(struct rtllib_device *ieee, struct 
sk_buff *skb)
>  {
> -	u16 errcode;
> +	int errcode;
>  	u8 *challenge;
>  	int chlen = 0;
>  	bool bSupportNmode = true, bHalfSupportNmode = false;
> @@ -2292,8 +2292,8 @@ static void rtllib_rx_auth_resp(struct 
rtllib_device *ieee, struct sk_buff *skb)
>  	if (errcode) {
>  		ieee->softmac_stats.rx_auth_rs_err++;
>  		netdev_info(ieee->dev,
> -			    "Authentication response status code 
0x%x",
> -			    errcode);
> +			    "Authentication response status code %d",
> +			    le16_to_cpu(errcode));

This is something that I'm still missing. Why do we need that call to 
le16_to_cpu on "errcode"?

"errcode" is returned by auth_parse()? I see that this function already 
changes the endianness of the returned value.

Thanks,

Fabio


>  		rtllib_associate_abort(ieee);
>  		return;
>  	}
> -- 
> 2.7.4
> 
> 
>