linux-kernel - [lvc-project] [PATCH] netfilter: ebtables: remove unnecessary NULL check

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Date:   Tue, 20 Jun 2023 18:25:49 +0300
From:   Igor Artemiev <Igor.A.Artemiev@...t.ru>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [lvc-project] [PATCH] netfilter: ebtables: remove unnecessary NULL check

In ebt_do_table() 'private->chainstack' cannot be NULL
and the 'cs' pointer is dereferenced below, so it does not make
sense to compare 'private->chainstack' with NULL. 

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
---
 net/bridge/netfilter/ebtables.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 757ec46fc45a..74daca8a5142 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -212,10 +212,7 @@ unsigned int ebt_do_table(void *priv, struct sk_buff *skb,
 	private = table->private;
 	cb_base = COUNTER_BASE(private->counters, private->nentries,
 	   smp_processor_id());
-	if (private->chainstack)
-		cs = private->chainstack[smp_processor_id()];
-	else
-		cs = NULL;
+	cs = private->chainstack[smp_processor_id()];
 	chaininfo = private->hook_entry[hook];
 	nentries = private->hook_entry[hook]->nentries;
 	point = (struct ebt_entry *)(private->hook_entry[hook]->data);
-- 
2.30.2