linux-kernel - Re: net/wireless/reg.c:144 suspicious rcu_dereference

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Message-ID: <87v9bpb1t0.fsf@codeaurora.org>
Date:   Fri, 22 Jan 2021 14:20:43 +0200
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Jiri Slaby <jirislaby@...nel.org>,
        Nick Kossifidis <mickflemm@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        linux-wireless@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: net/wireless/reg.c:144 suspicious rcu_dereference_check() usage!

Borislav Petkov <bp@...en8.de> writes:

> On Fri, Jan 22, 2021 at 11:11:24AM +0100, Borislav Petkov wrote:
>> Hi,
>> 
>> this triggers is on 5.11-rc3 + tip/x86/urgent (shouldn't matter tho),
>> 32-bit kernel:
>
> This looks like a multiple wireless drivers issue, this is on another
> 32-bit machine with ath5k this time:
>
> [   23.810222] ath5k 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
> [   23.847597] ath5k 0000:03:00.0: registered as 'phy0'
> [   24.504999] ath: EEPROM regdomain: 0x65
> [   24.516125] ath: EEPROM indicates we should expect a direct regpair map
> [   24.527286] ath: Country alpha2 being used: 00
> [   24.535435] ath: Regpair used: 0x65
>
> [   24.551461] =============================
> [   24.561941] WARNING: suspicious RCU usage
> [   24.572030] 5.11.0-rc3+ #1 Not tainted
> [   24.580276] -----------------------------
> [   24.590764] net/wireless/reg.c:144 suspicious rcu_dereference_check() usage!
> [   24.601730] 

Can you try this commit:

51d62f2f2c50 cfg80211: Save the regulatory domain with a lock

https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211.git/commit/?id=51d62f2f2c50

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches