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).
As found with Coccinelle[1], add __counted_by for struct rtw89_btc_btf_set_slot_table. Cc: Ping-Ke Shih <[email protected]> Cc: Kalle Valo <[email protected]> Cc: "Gustavo A. R. Silva" <[email protected]> Cc: [email protected] Cc: [email protected] Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <[email protected]> --- 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 { -- 2.34.1
