netdev - [PATCH] netfilter: x_tables: handle xt_register

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Message-Id: <20210823202729.2009-1-lukas.bulwahn@gmail.com>
Date:   Mon, 23 Aug 2021 22:27:29 +0200
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org
Cc:     netdev@...r.kernel.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] netfilter: x_tables: handle xt_register_template() returning an error value

Commit fdacd57c79b7 ("netfilter: x_tables: never register tables by
default") introduces the function xt_register_template(), and in one case,
a call to that function was missing the error-case handling.

Handle when xt_register_template() returns an error value.

This was identified with the clang-analyzer's Dead-Store analysis.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
 net/ipv4/netfilter/iptable_mangle.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/netfilter/iptable_mangle.c b/net/ipv4/netfilter/iptable_mangle.c
index b52a4c8a14fc..40417a3f930b 100644
--- a/net/ipv4/netfilter/iptable_mangle.c
+++ b/net/ipv4/netfilter/iptable_mangle.c
@@ -112,6 +112,8 @@ static int __init iptable_mangle_init(void)
 {
 	int ret = xt_register_template(&packet_mangler,
 				       iptable_mangle_table_init);
+	if (ret < 0)
+		return ret;
 
 	mangle_ops = xt_hook_ops_alloc(&packet_mangler, iptable_mangle_hook);
 	if (IS_ERR(mangle_ops)) {
-- 
2.26.2