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

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Date: Mon, 08 May 2023 11:44:44 +0300
From: Kalle Valo <kvalo@...nel.org>
To: 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>,  Arnd Bergmann <arnd@...db.de>,  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@...r.kernel.org,  linux-kernel@...r.kernel.org,  ath12k@...ts.infradead.org
Subject: Re: [PATCH] wireless: ath: work around false-positive stringop-overread warning

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.

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

Also I hope you find the time to add GCC 13 to crosstool :) Related to
this, last year we had a similar warning with GCC 11 for which I added this
not-so-pretty workaround:

abf93f369419 wifi: ath11k: mac: fix reading 16 bytes from a region of size 0 warning

https://git.kernel.org/linus/abf93f369419

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

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