linux-kernel - [PATCH net v3 1/7] net/sched: act_gate: zero-initialize netlink dump struct

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Message-ID: <20260121131954.2710459-2-p@1g4.org>
Date: Wed, 21 Jan 2026 13:20:35 +0000
From: Paul Moses <p@....org>
To: netdev@...r.kernel.org
Cc: 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>, Simon Horman <horms@...nel.org>, linux-kernel@...r.kernel.org, Paul Moses <p@....org>, stable@...r.kernel.org
Subject: [PATCH net v3 1/7] net/sched: act_gate: zero-initialize netlink dump struct

Zero-initialize the dump struct before selective assignment to avoid
leaking stack padding in netlink replies. This matches other actions
(e.g. act_connmark) that zero-init their dump structs.

Fixes: a51c328df310 ("net: qos: introduce a gate control flow action")
Cc: stable@...r.kernel.org
Signed-off-by: Paul Moses <p@....org>
---
 net/sched/act_gate.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/sched/act_gate.c b/net/sched/act_gate.c
index c1f75f2727576..aacd57e5f4374 100644
--- a/net/sched/act_gate.c
+++ b/net/sched/act_gate.c
@@ -499,16 +499,16 @@ static int tcf_gate_dump(struct sk_buff *skb, struct tc_action *a,
 {
 	unsigned char *b = skb_tail_pointer(skb);
 	struct tcf_gate *gact = to_gate(a);
-	struct tc_gate opt = {
-		.index    = gact->tcf_index,
-		.refcnt   = refcount_read(&gact->tcf_refcnt) - ref,
-		.bindcnt  = atomic_read(&gact->tcf_bindcnt) - bind,
-	};
+	struct tc_gate opt = { };
 	struct tcfg_gate_entry *entry;
 	struct tcf_gate_params *p;
 	struct nlattr *entry_list;
 	struct tcf_t t;

+	opt.index = gact->tcf_index;
+	opt.refcnt = refcount_read(&gact->tcf_refcnt) - ref;
+	opt.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind;
+
 	spin_lock_bh(&gact->tcf_lock);
 	opt.action = gact->tcf_action;

-- 
2.52.GIT