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Message-Id: <20230226144650.826470-28-sashal@kernel.org> Date: Sun, 26 Feb 2023 09:46:28 -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 6.1 28/49] 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 3ba8c291fcaa7..dca5352bdf3d7 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); -- 2.39.0
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