linux-kernel - Re: [PATCH net-next 1/2] ath10k: fix gcc-10 zero-length-bounds warnings

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Date:   Tue, 12 May 2020 07:33:42 +0000 (UTC)
From:   Kalle Valo <kvalo@...eaurora.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Michal Kazior <michal.kazior@...to.com>,
        Kalle Valo <kvalo@....qualcomm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Wen Gong <wgong@...eaurora.org>,
        Erik Stromdahl <erik.stromdahl@...il.com>,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] ath10k: fix gcc-10 zero-length-bounds
 warnings

Arnd Bergmann <arnd@...db.de> wrote:

> gcc-10 started warning about out-of-bounds access for zero-length
> arrays:
> 
> In file included from drivers/net/wireless/ath/ath10k/core.h:18,
>                  from drivers/net/wireless/ath/ath10k/htt_rx.c:8:
> drivers/net/wireless/ath/ath10k/htt_rx.c: In function 'ath10k_htt_rx_tx_fetch_ind':
> drivers/net/wireless/ath/ath10k/htt.h:1683:17: warning: array subscript 65535 is outside the bounds of an interior zero-length array 'struct htt_tx_fetch_record[0]' [-Wzero-length-bounds]
>  1683 |  return (void *)&ind->records[le16_to_cpu(ind->num_records)];
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/wireless/ath/ath10k/htt.h:1676:29: note: while referencing 'records'
>  1676 |  struct htt_tx_fetch_record records[0];
>       |                             ^~~~~~~
> 
> Make records[] a flexible array member to allow this, moving it behind
> the other zero-length member that is not accessed in a way that gcc
> warns about.
> 
> Fixes: 22e6b3bc5d96 ("ath10k: add new htt definitions")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Kalle Valo <kvalo@...eaurora.org>

2 patches applied to ath-next branch of ath.git, thanks.

9f12bebd512c ath10k: fix gcc-10 zero-length-bounds warnings
32221df6765b ath10k: fix ath10k_pci struct layout

-- 
https://patchwork.kernel.org/patch/11538233/

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