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

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Date:   Thu, 20 Apr 2023 16:04:14 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Kalle Valo <kvalo@...nel.org>,
        "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

On Mon, Apr 17, 2023 at 10:54:20PM +0200, Arnd Bergmann wrote:
> 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>

Reviewed-by: Simon Horman <simon.horman@...igine.com>

Note: I was not able to reproduce the problem described above.