linux-kernel - Re: [PATCH] staging: ks7010: remove redundant auth

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Date:   Mon, 18 Mar 2019 21:32:59 +0000
From:   Jeremy Sowden <jeremy@...zel.net>
To:     Colin King <colin.king@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Quytelda Kahja <quytelda@...alin.org>,
        devel@...verdev.osuosl.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: ks7010: remove redundant auth_type check

On 2019-03-18, at 10:57:49 +0000, Colin King wrote:
> The range check on auth_type is redundant as there is a prior
> check on the auth_type values and the only way the block is entered
> is if auth_type is one of TYPE_PMK1, TYPE_GMK1 and TYPE_GMK1.

"... and TYPE_GMK2."

> Hence the auth_type check can be removed.
>
> Detected by static analysis with cppcheck.
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/staging/ks7010/ks_hostif.c | 16 +++++++---------
>  1 file changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/ks7010/ks_hostif.c
> b/drivers/staging/ks7010/ks_hostif.c
> index 06ebea0be118..31a536791d5c 100644
> --- a/drivers/staging/ks7010/ks_hostif.c
> +++ b/drivers/staging/ks7010/ks_hostif.c
> @@ -362,6 +362,8 @@ int hostif_data_indication_wpa(struct
> ks_wlan_private *priv,
>  	     (auth_type == TYPE_GMK2 &&
>  	      priv->wpa.group_suite == IW_AUTH_CIPHER_TKIP)) &&
>  	    key->key_len) {
> +		int ret;
> +
>  		netdev_dbg(priv->net_dev, "TKIP: protocol=%04X: size=%u\n",
>  			   eth_proto, priv->rx_size);
>  		/* MIC save */
> @@ -369,15 +371,11 @@ int hostif_data_indication_wpa(struct
> ks_wlan_private *priv,
>  		       (priv->rxp) + ((priv->rx_size) - sizeof(recv_mic)),
>  		       sizeof(recv_mic));
>  		priv->rx_size = priv->rx_size - sizeof(recv_mic);
> -		if (auth_type > 0 && auth_type < 4) {	/* auth_type check */
> -			int ret;
> -
> -			ret = michael_mic(key->rx_mic_key,
> -					  priv->rxp, priv->rx_size,
> -					  0, mic);
> -			if (ret < 0)
> -				return ret;
> -		}
> +
> +		ret = michael_mic(key->rx_mic_key, priv->rxp, priv->rx_size,
> +				  0, mic);
> +		if (ret < 0)
> +			return ret;
>  		if (memcmp(mic, recv_mic, sizeof(mic)) != 0) {
>  			now = jiffies;
>  			mic_failure = &priv->wpa.mic_failure;

Acked-by: Jeremy Sowden <jeremy@...zel.net>