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Message-ID: <87ttwnnrer.fsf@kernel.org>
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
--
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