linux-kernel - [PATCH net] netfilter: nf_tables: Add null check for nla_nest_start_noflag() in nft_dump_basechain

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Message-ID: <20230524122448.1860908-1-Ilia.Gavrilov@infotecs.ru>
Date:   Wed, 24 May 2023 12:25:27 +0000
From:   Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
To:     Pablo Neira Ayuso <pablo@...filter.org>
CC:     Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
        "coreteam@...filter.org" <coreteam@...filter.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lvc-project@...uxtesting.org" <lvc-project@...uxtesting.org>
Subject: [PATCH net] netfilter: nf_tables: Add null check for
 nla_nest_start_noflag() in nft_dump_basechain_hook()

The nla_nest_start_noflag() function may fail and return NULL;
the return value needs to be checked.

Found by InfoTeCS on behalf of Linux Verification Center
(linuxtesting.org) with SVACE.

Fixes: d54725cd11a5 ("netfilter: nf_tables: support for multiple devices per netdev hook")
Signed-off-by: Gavrilov Ilia <Ilia.Gavrilov@...otecs.ru>
---
 net/netfilter/nf_tables_api.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 8c09e4d12ac1..b49f7f877ba6 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1588,6 +1588,8 @@ static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
 
 	if (nft_base_chain_netdev(family, ops->hooknum)) {
 		nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
+		if (!nest_devs)
+			goto nla_put_failure;
 		list_for_each_entry(hook, &basechain->hook_list, list) {
 			if (!first)
 				first = hook;
-- 
2.30.2