linux-kernel - RE: [PATCH] rtw89: use flexible array member in rtw89_btc_btf

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Date:   Wed, 24 May 2023 01:24:50 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     Arnd Bergmann <arnd@...nel.org>, Kalle Valo <kvalo@...nel.org>
CC:     Arnd Bergmann <arnd@...db.de>, DeanKu <ku920601@...ltek.com>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] rtw89: use flexible array member in rtw89_btc_btf_tlv



> -----Original Message-----
> From: Arnd Bergmann <arnd@...nel.org>
> Sent: Tuesday, May 23, 2023 7:33 PM
> To: Ping-Ke Shih <pkshih@...ltek.com>; Kalle Valo <kvalo@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>; DeanKu <ku920601@...ltek.com>; linux-wireless@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Subject: [PATCH] rtw89: use flexible array member in rtw89_btc_btf_tlv
> 
> From: Arnd Bergmann <arnd@...db.de>
> 
> struct rtw89_btc_btf_tlv contains a one-byte member that is intended as a
> flexible array:
> 
> In function 'fortify_memcpy_chk',
>     inlined from '_append_tdma' at drivers/net/wireless/realtek/rtw89/coex.c:1579:3:
> include/linux/fortify-string.h:583:25: error: call to '__write_overflow_field' declared with attribute
> warning: detected write beyond size of field (1st parameter); maybe use struct_group()?
> [-Werror=attribute-warning]
>   583 |                         __write_overflow_field(p_size_field, size);
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Make this actually use a flexible array to let the compiler understand.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Ping-Ke Shih <pkshih@...ltek.com>

> ---
>  drivers/net/wireless/realtek/rtw89/coex.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/realtek/rtw89/coex.c b/drivers/net/wireless/realtek/rtw89/coex.c
> index 3a586a971e8f..bda0e1e99a8c 100644
> --- a/drivers/net/wireless/realtek/rtw89/coex.c
> +++ b/drivers/net/wireless/realtek/rtw89/coex.c
> @@ -206,7 +206,7 @@ static const struct rtw89_btc_ver rtw89_btc_ver_defs[] = {
>  struct rtw89_btc_btf_tlv {
>         u8 type;
>         u8 len;
> -       u8 val[1];
> +       u8 val[];
>  } __packed;
> 
>  enum btc_btf_set_report_en {
> --
> 2.39.2