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Date: Fri,  6 Oct 2023 13:17:15 -0700
From: Kees Cook <>
To: Ping-Ke Shih <>
Cc: Kees Cook <>,
	Kalle Valo <>,
	"Gustavo A. R. Silva" <>,,,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,
Subject: [PATCH] wifi: rtw89: coex: Annotate struct rtw89_btc_btf_set_slot_table with __counted_by

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

As found with Coccinelle[1], add __counted_by for struct

Cc: Ping-Ke Shih <>
Cc: Kalle Valo <>
Cc: "Gustavo A. R. Silva" <>
Link: [1]
Signed-off-by: Kees Cook <>
 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 4ba8b3df70ae..d66a1152c3f5 100644
--- a/drivers/net/wireless/realtek/rtw89/coex.c
+++ b/drivers/net/wireless/realtek/rtw89/coex.c
@@ -237,7 +237,7 @@ struct rtw89_btc_btf_set_report {
 struct rtw89_btc_btf_set_slot_table {
 	u8 fver;
 	u8 tbl_num;
-	u8 buf[];
+	u8 buf[] __counted_by(tbl_num);
 } __packed;
 struct rtw89_btc_btf_set_mon_reg {

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