Re: [PATCH] wifi: brcmfmac: firmware: Annotate struct brcmf_fw_request with __counted_by

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

On 9/15/23 14:05, Kees Cook 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 checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct brcmf_fw_request.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Arend van Spriel <aspriel@gmail.com>
> Cc: Franky Lin <franky.lin@broadcom.com>
> Cc: Hante Meuleman <hante.meuleman@broadcom.com>
> Cc: Kalle Valo <kvalo@kernel.org>
> Cc: Matthias Brugger <mbrugger@suse.com>
> Cc: Hector Martin <marcan@marcan.st>
> Cc: "Alvin Šipraga" <alsi@bang-olufsen.dk>
> Cc: Hans de Goede <hdegoede@redhat.com>
> Cc: linux-wireless@vger.kernel.org
> Cc: brcm80211-dev-list.pdl@broadcom.com
> Cc: SHA-cyfmac-dev-list@infineon.com
> Signed-off-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
> index 1266cbaee072..4002d326fd21 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.h
> @@ -69,7 +69,7 @@ struct brcmf_fw_request {
>   	u16 bus_nr;
>   	u32 n_items;
>   	const char *board_types[BRCMF_FW_MAX_BOARD_TYPES];
> -	struct brcmf_fw_item items[];
> +	struct brcmf_fw_item items[] __counted_by(n_items);
>   };
>   
>   struct brcmf_fw_name {