linux-kernel - [PATCH -next 4/5] netfilter: iptables: Use kmemdup_array() instead of kmemdup() for multiple allocation

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Message-ID: <20240828071004.1245213-5-ruanjinjie@huawei.com>
Date: Wed, 28 Aug 2024 15:10:03 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <pablo@...filter.org>, <kadlec@...filter.org>, <roopa@...dia.com>,
	<razor@...ckwall.org>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <dsahern@...nel.org>,
	<krzk@...nel.org>, <netfilter-devel@...r.kernel.org>,
	<coreteam@...filter.org>, <bridge@...ts.linux.dev>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH -next 4/5] netfilter: iptables: Use kmemdup_array() instead of kmemdup() for multiple allocation

Let the kmemdup_array() take care about multiplication and possible
overflows.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 net/ipv4/netfilter/ip_tables.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index fe89a056eb06..096bfef472b1 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -1767,7 +1767,7 @@ int ipt_register_table(struct net *net, const struct xt_table *table,
 		goto out_free;
 	}
 
-	ops = kmemdup(template_ops, sizeof(*ops) * num_ops, GFP_KERNEL);
+	ops = kmemdup_array(template_ops, num_ops, sizeof(*ops), GFP_KERNEL);
 	if (!ops) {
 		ret = -ENOMEM;
 		goto out_free;
-- 
2.34.1