netdev - [PATCH] Bluetooth: Annotate struct hci_drv_rp_read_info with __counted_by

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Message-ID: <20250810215319.2629-2-thorsten.blum@linux.dev>
Date: Sun, 10 Aug 2025 23:53:20 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Marcel Holtmann <marcel@...tmann.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Luiz Augusto von Dentz <luiz.dentz@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-bluetooth@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] Bluetooth: Annotate struct hci_drv_rp_read_info with __counted_by_le()

Add the __counted_by_le() compiler attribute to the flexible array
member 'supported_commands' to improve access bounds-checking via
CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 include/net/bluetooth/hci_drv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/bluetooth/hci_drv.h b/include/net/bluetooth/hci_drv.h
index 2f01c44f05ec..3fd6fdbdb02e 100644
--- a/include/net/bluetooth/hci_drv.h
+++ b/include/net/bluetooth/hci_drv.h
@@ -47,7 +47,7 @@ struct hci_drv_ev_cmd_complete {
 struct hci_drv_rp_read_info {
 	__u8	driver_name[HCI_DRV_MAX_DRIVER_NAME_LENGTH];
 	__le16	num_supported_commands;
-	__le16	supported_commands[];
+	__le16	supported_commands[] __counted_by_le(num_supported_commands);
 } __packed;
 
 /* Driver specific OGF (Opcode Group Field)
-- 
2.50.1