netdev - [PATCH AUTOSEL 6.2 30/53] netfilter: nf_tables: NULL pointer dereference in nf_tables

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Date:   Sun, 26 Feb 2023 09:44:22 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Alok Tiwari <alok.a.tiwari@...cle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <sashal@...nel.org>, kadlec@...filter.org,
        fw@...len.de, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.2 30/53] netfilter: nf_tables: NULL pointer dereference in nf_tables_updobj()

From: Alok Tiwari <alok.a.tiwari@...cle.com>

[ Upstream commit dac7f50a45216d652887fb92d6cd3b7ca7f006ea ]

static analyzer detect null pointer dereference case for 'type'
function __nft_obj_type_get() can return NULL value which require to handle
if type is NULL pointer return -ENOENT.

This is a theoretical issue, since an existing object has a type, but
better add this failsafe check.

Signed-off-by: Alok Tiwari <alok.a.tiwari@...cle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/netfilter/nf_tables_api.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 8c09e4d12ac1e..fc8256b00b320 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6999,6 +6999,9 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
 			return -EOPNOTSUPP;
 
 		type = __nft_obj_type_get(objtype);
+		if (WARN_ON_ONCE(!type))
+			return -ENOENT;
+
 		nft_ctx_init(&ctx, net, skb, info->nlh, family, table, NULL, nla);
 
 		return nf_tables_updobj(&ctx, type, nla[NFTA_OBJ_DATA], obj);
-- 
2.39.0