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

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Message-ID: <87zhae4r35.fsf@kamboji.qca.qualcomm.com>
Date:   Mon, 11 May 2020 15:02:38 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Michal Kazior <michal.kazior@...to.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

"Gustavo A. R. Silva" <gustavoars@...nel.org> writes:

> Arnd,
>
> On Sat, May 09, 2020 at 02:06:32PM +0200, Arnd Bergmann 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: 3ba225b506a2 ("treewide: Replace zero-length array with
>> flexible-array member")
>
> This treewide patch no longer contains changes for ath10k. I removed them
> since Monday (05/04/2020). So, this "Fixes" tag does not apply.

Ok, I'll remove it. Also I'll take these to my ath.git tree, not to
net-next.

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