netdev - Re: [PATCH] wireless: ath: work around false-positive stringop-overread warning

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Message-Id: <504c5a7d-0bfd-4b1e-a7f0-65d072657e0a@app.fastmail.com>
Date: Mon, 08 May 2023 10:52:11 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Kalle Valo" <kvalo@...nel.org>, "Arnd Bergmann" <arnd@...nel.org>
Cc: "David S . Miller" <davem@...emloft.net>,
 "Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>,
 "Paolo Abeni" <pabeni@...hat.com>, "Johannes Berg" <johannes.berg@...el.com>,
 "Manikanta Pubbisetty" <quic_mpubbise@...cinc.com>,
 "Wen Gong" <quic_wgong@...cinc.com>,
 "Baochen Qiang" <quic_bqiang@...cinc.com>,
 "Sowmiya Sree Elavalagan" <quic_ssreeela@...cinc.com>,
 ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org,
 Netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
 ath12k@...ts.infradead.org
Subject: Re: [PATCH] wireless: ath: work around false-positive stringop-overread
 warning

On Mon, May 8, 2023, at 10:44, Kalle Valo wrote:
> Arnd Bergmann <arnd@...nel.org> writes:
>
>> From: Arnd Bergmann <arnd@...db.de>
>>
>> In a rare arm64 randconfig build, I got multiple warnings for ath11k
>> and ath12k:
>>
>> In function 'ath11k_peer_assoc_h_ht',
>>     inlined from 'ath11k_peer_assoc_prepare' at drivers/net/wireless/ath/ath11k/mac.c:2665:2:
>> drivers/net/wireless/ath/ath11k/mac.c:1709:13: error: 'ath11k_peer_assoc_h_ht_masked' reading 10 bytes from a region of size 0 [-Werror=stringop-overread]
>>  1709 |         if (ath11k_peer_assoc_h_ht_masked(ht_mcs_mask))
>>       |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> This happens whenever gcc-13 fails to inline one of the functions
>> that take a fixed-length array argument but gets passed a pointer.
>>
>> Change these functions to all take a regular pointer argument
>> instead.
>>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> s/wireless:/wifi:/ but I can fix that.

Ok, thanks!

> In a awat it's a shame to lose the explicit length but I guess there's
> no other way to fix this?

There might be, but I couldn't figure out a way that works.

> Also I hope you find the time to add GCC 13 to crosstool :) Related to
> this

I uploaded gcc-13.1.0 binaries last week, but still need to
update the html page, so it's not yet linked. You can navigate
the directories from the gcc-12 builds.

     Arnd