linux-kernel - [PATCH v2 6.1] netfilter: Null pointer dereference in nf_tables

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Date:   Tue, 17 Jan 2023 07:45:49 -0800
From:   Alok Tiwari <alok.a.tiwari@...cle.com>
To:     linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org
Cc:     alok.a.tiwari@...cle.com, darren.kenny@...cle.com
Subject: [PATCH v2 6.1] netfilter: Null pointer dereference in nf_tables_updobj

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

Signed-off-by: Alok Tiwari <alok.a.tiwari@...cle.com>
---
 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 3ba8c291fcaa..dca5352bdf3d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6951,6 +6951,9 @@ 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);
-- 
2.38.1