linux-hardening - [PATCH v2][next] sched: act_ct: avoid -Wflex-array-member-not-at-end warning

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Message-ID: <ZrY0JMVsImbDbx6r@cute>
Date: Fri, 9 Aug 2024 09:22:12 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Jamal Hadi Salim <jhs@...atatu.com>,
	Cong Wang <xiyou.wangcong@...il.com>, Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: [PATCH v2][next] sched: act_ct: avoid -Wflex-array-member-not-at-end
 warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Remove unnecessary flex-array member `pad[]` and refactor the related
code a bit.

Fix the following warning:
net/sched/act_ct.c:57:29: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v2:
 - Remove flex array. (Jakub).

 net/sched/act_ct.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index 3ba8e7e739b5..2197eb625658 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -44,8 +44,6 @@ static DEFINE_MUTEX(zones_mutex);
 struct zones_ht_key {
 	struct net *net;
 	u16 zone;
-	/* Note : pad[] must be the last field. */
-	u8  pad[];
 };
 
 struct tcf_ct_flow_table {
@@ -62,7 +60,7 @@ struct tcf_ct_flow_table {
 static const struct rhashtable_params zones_params = {
 	.head_offset = offsetof(struct tcf_ct_flow_table, node),
 	.key_offset = offsetof(struct tcf_ct_flow_table, key),
-	.key_len = offsetof(struct zones_ht_key, pad),
+	.key_len = offsetofend(struct zones_ht_key, zone),
 	.automatic_shrinking = true,
 };
 
-- 
2.34.1