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From: Lukas Bulwahn <>
To: Pablo Neira Ayuso <>,
	Jozsef Kadlecsik <>,
	Florian Westphal <>,,
	clang-built-linux <>,,,
	Lukas Bulwahn <>
Subject: [PATCH] netfilter: x_tables: handle xt_register_template() returning an error value
Date: Mon, 23 Aug 2021 22:27:29 +0200	[thread overview]
Message-ID: <> (raw)

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 <>
 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,
+	if (ret < 0)
+		return ret;
 	mangle_ops = xt_hook_ops_alloc(&packet_mangler, iptable_mangle_hook);
 	if (IS_ERR(mangle_ops)) {

             reply	other threads:[~2021-08-23 20:27 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-23 20:27 Lukas Bulwahn [this message]
2021-08-23 22:26 ` [PATCH] netfilter: x_tables: handle xt_register_template() returning an error value Florian Westphal
2021-08-25 11:07 ` Pablo Neira Ayuso

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