linux-kernel - Re: [PATCH wireless v2] nl80211/cfg80211: add nla

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Message-ID: <9e1db7f3-fd18-4b3b-a912-3cf6efd96fed@quicinc.com>
Date: Fri, 19 Jan 2024 15:47:53 -0800
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Lin Ma <linma@....edu.cn>, <davem@...emloft.net>, <edumazet@...gle.com>,
        <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kvalo@...nel.org>
Subject: Re: [PATCH wireless v2] nl80211/cfg80211: add nla_policy for S1G band

On 1/19/2024 7:12 AM, Lin Ma wrote:
> Our detector has identified another case of an incomplete policy.
> Specifically, the commit df78a0c0b67d ("nl80211: S1G band and channel
> definitions") introduced the NL80211_BAND_S1GHZ attribute to
> nl80211_band, but it neglected to update the
> nl80211_match_band_rssi_policy accordingly.
> 
> Similar commits that add new band types, such as the initial
> commit 1e1b11b6a111 ("nl80211/cfg80211: Specify band specific min RSSI
> thresholds with sched scan"), the commit e548a1c36b11 ("cfg80211: add 6GHz
> in code handling array with NUM_NL80211_BANDS entries"), and the
> commit 63fa04266629 ("nl80211: Add LC placeholder band definition to
> nl80211_band"), all require updates to the policy.
> Failure to do so could result in accessing an attribute of unexpected
> length in the function nl80211_parse_sched_scan_per_band_rssi.
> 
> To resolve this issue, this commit adds the policy for the
> NL80211_BAND_S1GHZ attribute.
> 
> Fixes: df78a0c0b67d ("nl80211: S1G band and channel definitions")
> Signed-off-by: Lin Ma <linma@....edu.cn>
> ---
> V1 -> V2: change net-next to wireless as suggested
> 
>  net/wireless/nl80211.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
> index 60877b532993..980300621a60 100644
> --- a/net/wireless/nl80211.c
> +++ b/net/wireless/nl80211.c
> @@ -911,6 +911,7 @@ nl80211_match_band_rssi_policy[NUM_NL80211_BANDS] = {
>  	[NL80211_BAND_5GHZ] = { .type = NLA_S32 },
>  	[NL80211_BAND_6GHZ] = { .type = NLA_S32 },
>  	[NL80211_BAND_60GHZ] = { .type = NLA_S32 },
> +	[NL80211_BAND_S1GHZ] = { .type = NLA_S32 },
>  	[NL80211_BAND_LC]    = { .type = NLA_S32 },
>  };
>  
something is really suspicious since the NL80211_BAND_* enums are
*value* enums, not attribute ID enums, and hence they should never be
used in an nla_policy.

what is actually using these as attribute IDs, noting that
NL80211_BAND_2GHZ == 0 and hence cannot be used as an attribute ID

seems the logic that introduced this policy needs to be revisited.