linux-kernel - Re: [PATCH V2] staging: rtl8192e: Fix signedness bug in rtllib_rx_assoc

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Date:   Fri, 15 Apr 2022 08:25:02 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Haowen Bai <baihaowen@...zu.com>
Cc:     gregkh@...uxfoundation.org, davem@...emloft.net, len.baker@....com,
        dave@...olabs.net, edumazet@...gle.com,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] staging: rtl8192e: Fix signedness bug in
 rtllib_rx_assoc_resp()

On Fri, Apr 15, 2022 at 10:09:31AM +0800, Haowen Bai wrote:
> function rtllib_rx_assoc_resp () unsigned errcode receive auth_parse()'s
> errcode -ENOMEM.
> 
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>
> ---
> V1->V2: reduce return random value; print its own error message.
> 
>  drivers/staging/rtl8192e/rtllib_softmac.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_softmac.c b/drivers/staging/rtl8192e/rtllib_softmac.c
> index 82bf05eb1cbf..8a0961e64a8c 100644
> --- a/drivers/staging/rtl8192e/rtllib_softmac.c
> +++ b/drivers/staging/rtl8192e/rtllib_softmac.c
> @@ -1764,7 +1764,7 @@ static void rtllib_softmac_check_all_nets(struct rtllib_device *ieee)
>  	spin_unlock_irqrestore(&ieee->lock, flags);
>  }
>  
> -static inline u16 auth_parse(struct net_device *dev, struct sk_buff *skb,
> +static inline s16 auth_parse(struct net_device *dev, struct sk_buff *skb,

Could you make this an int instead of s16.  s16 is always a bit weird.

>  			     u8 **challenge, int *chlen)
>  {
>  	struct rtllib_authentication *a;
> @@ -1773,7 +1773,7 @@ static inline u16 auth_parse(struct net_device *dev, struct sk_buff *skb,
>  	if (skb->len <  (sizeof(struct rtllib_authentication) -
>  	    sizeof(struct rtllib_info_element))) {
>  		netdev_dbg(dev, "invalid len in auth resp: %d\n", skb->len);
> -		return 0xcafe;
> +		return -EINVAL;
>  	}
>  	*challenge = NULL;
>  	a = (struct rtllib_authentication *) skb->data;
> @@ -1787,7 +1787,7 @@ static inline u16 auth_parse(struct net_device *dev, struct sk_buff *skb,
>  				return -ENOMEM;
>  		}
>  	}
> -	return le16_to_cpu(a->status);
> +	return a->status;

But then just say:

	if (a->status) {
		netdev_info(ieee->dev, "blah blah failed");
		return -EINVAL;
	}

	return 0;

If you look up what a->status is, it can only be
WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG which is not worth preserving really.

regards,
dan carpenter