linux-kernel - Re: [PATCH v1 net] cfg80211: pmsr: use correct nla_get

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Message-ID: <b7583de35462b06bbfbeb39bf2435bcb5f04be06.camel@sipsolutions.net>
Date: Mon, 20 May 2024 13:40:56 +0200
From: Johannes Berg <johannes@...solutions.net>
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
Subject: Re: [PATCH v1 net] cfg80211: pmsr: use correct nla_get_uX functions

Couple of minor comments:

The subject is missing wifi: prefix.

On Mon, 2024-05-20 at 15:33 +0800, Lin Ma wrote:
> The commit 9bb7e0f24e7e ("cfg80211: add peer measurement with FTM
> initiator API") defines four attributes, which are
> 
> - `NL80211_PMSR_FTM_REQ_ATTR_NUM_BURSTS_EXP` with NLA_U8 type
> - `NL80211_PMSR_FTM_REQ_ATTR_BURST_PERIOD` with NLA_U16 type
> - `NL80211_PMSR_FTM_REQ_ATTR_BURST_DURATION` with NLA_U8 type
> - `NL80211_PMSR_FTM_REQ_ATTR_NUM_FTMR_RETRIES` with NLA_U8 type
> 
> However, the consumers of these attributes in `pmsr_parse_ftm` blindly
> all use `nla_get_u32`, which is incorrect. Hence, fix these with correct
> `nla_get_u8` and `nla_get_u16`.

Maybe mention a bit more clearly that the _policy_ actually defines them
with those types, so the users are incorrect, vs. a possible scenario
where the kernel's documentation is just incorrect and we have to keep
the code as-is for userspace to continue to function.

I believe the changes are correct since the policy wants the right types
and then on little-endian platforms it'll all work ...

johannes