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From:   Kalle Valo <kvalo@kernel.org>
To:     Juerg Haefliger <juerg.haefliger@canonical.com>
Cc:     aspriel@gmail.com, franky.lin@broadcom.com,
        hante.meuleman@broadcom.com, linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com,
        SHA-cyfmac-dev-list@infineon.com, linux-kernel@vger.kernel.org,
        linus.walleij@linaro.org, marcan@marcan.st, keescook@chromium.org,
        gustavoars@kernel.org, hdegoede@redhat.com,
        ryohei.kondo@cypress.com
Subject: Re: [PATCH] wifi: brcmfmac: Replace 1-element arrays with flexible
 arrays
References: <20230913065421.12615-1-juerg.haefliger@canonical.com>
        <87msxqlaao.fsf@kernel.org> <20230913111747.35839fd8@gollum>
Date:   Wed, 13 Sep 2023 14:01:18 +0300
In-Reply-To: <20230913111747.35839fd8@gollum> (Juerg Haefliger's message of
        "Wed, 13 Sep 2023 11:17:47 +0200")
Message-ID: <87jzsucp6p.fsf@kernel.org>
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Juerg Haefliger <juerg.haefliger@canonical.com> writes:

> On Wed, 13 Sep 2023 11:58:07 +0300
> Kalle Valo <kvalo@kernel.org> wrote:
>
>> Juerg Haefliger <juerg.haefliger@canonical.com> writes:
>> 
>> > Since commit 2d47c6956ab3 ("ubsan: Tighten UBSAN_BOUNDS on GCC"),
>> > UBSAN_BOUNDS no longer pretends 1-element arrays are unbounded. Walking
>> > 'element' and 'channel_list' will trigger warnings, so make them proper
>> > flexible arrays.
>> >
>> > False positive warnings were:
>> >
>> >   UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:6984:20
>> >   index 1 is out of range for type '__le32 [1]'
>> >
>> >   UBSAN: array-index-out-of-bounds in drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:1126:27
>> >   index 1 is out of range for type '__le16 [1]'
>> >
>> > for these lines of code:
>> >
>> >   6884  ch.chspec = (u16)le32_to_cpu(list->element[i]);
>> >
>> >   1126  params_le->channel_list[i] = cpu_to_le16(chanspec);
>> >
>> > Signed-off-by: Juerg Haefliger <juerg.haefliger@canonical.com>  
>> 
>> Should this be queued for v6.6?
>
> I would think so. It's a problem since 6.5. Which reminds me that I should
> have added:
>
> Cc: stable@vger.kernel.org # 6.5+

I can add that during commit.

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