[PATCH 6.9 165/281] netfilter: nft_inner: validate mandatory meta and payload

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6.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Davide Ornaghi <d.ornaghi97@xxxxxxxxx>

[ Upstream commit c4ab9da85b9df3692f861512fe6c9812f38b7471 ]

Check for mandatory netlink attributes in payload and meta expression
when used embedded from the inner expression, otherwise NULL pointer
dereference is possible from userspace.

Fixes: a150d122b6bd ("netfilter: nft_meta: add inner match support")
Fixes: 3a07327d10a0 ("netfilter: nft_inner: support for inner tunnel header matching")
Signed-off-by: Davide Ornaghi <d.ornaghi97@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 net/netfilter/nft_meta.c    | 3 +++
 net/netfilter/nft_payload.c | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index ba0d3683a45d3..9139ce38ea7b9 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -839,6 +839,9 @@ static int nft_meta_inner_init(const struct nft_ctx *ctx,
 	struct nft_meta *priv = nft_expr_priv(expr);
 	unsigned int len;
 
+	if (!tb[NFTA_META_KEY] || !tb[NFTA_META_DREG])
+		return -EINVAL;
+
 	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
 	switch (priv->key) {
 	case NFT_META_PROTOCOL:
diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c
index 0c43d748e23ae..50429cbd42da4 100644
--- a/net/netfilter/nft_payload.c
+++ b/net/netfilter/nft_payload.c
@@ -650,6 +650,10 @@ static int nft_payload_inner_init(const struct nft_ctx *ctx,
 	struct nft_payload *priv = nft_expr_priv(expr);
 	u32 base;
 
+	if (!tb[NFTA_PAYLOAD_BASE] || !tb[NFTA_PAYLOAD_OFFSET] ||
+	    !tb[NFTA_PAYLOAD_LEN] || !tb[NFTA_PAYLOAD_DREG])
+		return -EINVAL;
+
 	base   = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
 	switch (base) {
 	case NFT_PAYLOAD_TUN_HEADER:
-- 
2.43.0







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