linux-hardening - [PATCH -next] net: dsa: felix: Annotate struct action_gate_entry with __counted

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Message-ID: <20240904014956.2035117-1-lihongbo22@huawei.com>
Date: Wed, 4 Sep 2024 09:49:56 +0800
From: Hongbo Li <lihongbo22@...wei.com>
To: <vladimir.oltean@....com>, <claudiu.manoil@....com>,
	<alexandre.belloni@...tlin.com>, <andrew@...n.ch>, <f.fainelli@...il.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <kees@...nel.org>, <gustavoars@...nel.org>
CC: <netdev@...r.kernel.org>, <linux-hardening@...r.kernel.org>,
	<lihongbo22@...wei.com>
Subject: [PATCH -next] net: dsa: felix: Annotate struct action_gate_entry with __counted_by

Add the __counted_by compiler attribute to the flexible array member
entries to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Signed-off-by: Hongbo Li <lihongbo22@...wei.com>
---
 drivers/net/dsa/ocelot/felix_vsc9959.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/felix_vsc9959.c b/drivers/net/dsa/ocelot/felix_vsc9959.c
index ba37a566da39..73d053501fb1 100644
--- a/drivers/net/dsa/ocelot/felix_vsc9959.c
+++ b/drivers/net/dsa/ocelot/felix_vsc9959.c
@@ -1733,7 +1733,7 @@ struct felix_stream_gate {
 	u64 cycletime;
 	u64 cycletime_ext;
 	u32 num_entries;
-	struct action_gate_entry entries[];
+	struct action_gate_entry entries[] __counted_by(num_entries);
 };
 
 struct felix_stream_gate_entry {
-- 
2.34.1