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From:   Kees Cook <keescook@chromium.org>
To:     Arend van Spriel <aspriel@gmail.com>
Cc:     Kees Cook <keescook@chromium.org>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        Matthias Brugger <mbrugger@suse.com>,
        Hector Martin <marcan@marcan.st>,
        =?UTF-8?q?Alvin=20=C5=A0ipraga?= <alsi@bang-olufsen.dk>,
        Hans de Goede <hdegoede@redhat.com>,
        linux-wireless@vger.kernel.org,
        brcm80211-dev-list.pdl@broadcom.com,
        SHA-cyfmac-dev-list@infineon.com,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>,
        "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
        linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
        linux-hardening@vger.kernel.org
Subject: [PATCH] wifi: brcmfmac: firmware: Annotate struct brcmf_fw_request with __counted_by
Date:   Fri, 15 Sep 2023 13:05:52 -0700
Message-Id: <20230915200552.never.642-kees@kernel.org>
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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>
---
 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 {
-- 
2.34.1