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From:   Arend Van Spriel <arend.vanspriel@broadcom.com>
To:     "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>
CC:     <linux-wireless@vger.kernel.org>,
        <brcm80211-dev-list.pdl@broadcom.com>,
        <SHA-cyfmac-dev-list@infineon.com>, <linux-kernel@vger.kernel.org>,
        <linux-hardening@vger.kernel.org>
Date:   Tue, 10 Oct 2023 16:26:25 +0200
Message-ID: <18b19fb5a68.279b.9b12b7fc0a3841636cfb5e919b41b954@broadcom.com>
In-Reply-To: <ZSRzrIe0345eymk2@work>
References: <ZSRzrIe0345eymk2@work>
User-Agent: AquaMail/1.46.0 (build: 104600328)
Subject: Re: [PATCH][next] wifi: brcmfmac: fweh: Add __counted_by for struct brcmf_fweh_queue_item and use struct_size()
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On October 9, 2023 11:42:11 PM "Gustavo A. R. Silva" 
<gustavoars@kernel.org> wrote:

> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
> array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> Also, relocate `event->datalen = datalen;` to before calling
> `memcpy(event->data, data, datalen);`, so that the __counted_by
> annotation has effect, and flex-array member `data` can be properly
> bounds-checked at run-time.
>
> While there, use struct_size() helper, instead of the open-coded
> version, to calculate the size for the allocation of the whole
> flexible structure, including of course, the flexible-array member.
>
> This code was found with the help of Coccinelle, and audited and
> fixed manually.

From the description above I think this change looks sane so...

Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)


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