netdev - [PATCH net] net: flower: fix stack-out-of-bounds in fl_set_key

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Message-ID: <20230724163254.106178-1-edumazet@google.com>
Date: Mon, 24 Jul 2023 16:32:54 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: Jamal Hadi Salim <jhs@...atatu.com>, Cong Wang <xiyou.wangcong@...il.com>, 
	Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, syzbot <syzkaller@...glegroups.com>, 
	Simon Horman <simon.horman@...igine.com>, Ido Schimmel <idosch@...dia.com>
Subject: [PATCH net] net: flower: fix stack-out-of-bounds in fl_set_key_cfm()

Typical misuse of

	nla_parse_nested(array, XXX_MAX, ...);

array must be declared as

	struct nlattr *array[XXX_MAX + 1];

Fixes: 7cfffd5fed3e ("net: flower: add support for matching cfm fields")
Reported-by: syzbot <syzkaller@...glegroups.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Simon Horman <simon.horman@...igine.com>
Cc: Ido Schimmel <idosch@...dia.com>
---
 net/sched/cls_flower.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 8da9d039d964ea417700a2f59ad95a9ce52f5eab..3c7a272bf7c7cf7d4ae21b5370cbc428086d6979 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1709,7 +1709,7 @@ static int fl_set_key_cfm(struct nlattr **tb,
 			  struct fl_flow_key *mask,
 			  struct netlink_ext_ack *extack)
 {
-	struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX];
+	struct nlattr *nla_cfm_opt[TCA_FLOWER_KEY_CFM_OPT_MAX + 1];
 	int err;
 
 	if (!tb[TCA_FLOWER_KEY_CFM])
-- 
2.41.0.487.g6d72f3e995-goog