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Date:	Mon, 6 Jan 2014 00:45:55 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dan LaManna <dan.lamanna@...il.com>
Cc:	gregkh@...uxfoundation.org, teobaluta@...il.com,
	andrea.merello@...il.com, linville@...driver.com,
	rusty@...tcorp.com.au, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: rtl8187se: fix styling issues in r8180_wx.c

On Sun, Jan 05, 2014 at 04:17:36PM -0500, Dan LaManna wrote:
> @@ -1358,22 +1358,22 @@ static inline int is_same_network(struct ieee80211_network *src,
>  		 * We treat all <hidden> with the same BSSID and channel
>  		 * as one network
>  		 */
> -		return (((src->ssid_len == dst->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) && /* YJ,mod, 080819,for hidden ap */
> +		return ((src->ssid_len == dst->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) && /* YJ,mod, 080819,for hidden ap */
>  			(src->channel == dst->channel) &&
>  			!memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
>  			(!memcmp(src->ssid, dst->ssid, src->ssid_len) || (ieee->iw_mode == IW_MODE_INFRA)) &&  /* YJ,mod, 080819,for hidden ap */
>  			((src->capability & WLAN_CAPABILITY_IBSS) ==
>  			(dst->capability & WLAN_CAPABILITY_IBSS)) &&
>  			((src->capability & WLAN_CAPABILITY_BSS) ==
> -			(dst->capability & WLAN_CAPABILITY_BSS)));
> +			(dst->capability & WLAN_CAPABILITY_BSS));
>  }
>  

Break this up.

	if (src->channel != dst->channel)
		return 0;

	if (memcmp(src->bssid, dst->bssid, ETH_ALEN) != 0)
		return 0;

	if (ieee->iw_mode == IW_MODE_INFRA) {
		if (src->ssid_len != dst->ssid_len)
			return 0;
		if (memcmp(src->ssid, dst->ssid, src->ssid_len) != 0)
			return 0;
	}

	if (src->capability & WLAN_CAPABILITY_IBSS !=
	    dst->capability & WLAN_CAPABILITY_IBSS)
		return 0;
	if (src->capability & WLAN_CAPABILITY_BSS !=
	    dst->capability & WLAN_CAPABILITY_BSS)
	    	return 0;

	return 1;

In the original code we don't verify that dst->ssid_len is valid if
ieee->iw_mode == IW_MODE_INFRA.  That means there is a potential Oops
if we read too far in the memcmp(src->ssid, dst->ssid, src->ssid_len).
I haven't reviewed the callers so it may not be a real issue.

regards,
dan carpenter


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