netfilter: nft_nat: correct length for loading protocol registers

[ Upstream commit 15b452e22a2d0b3759478c11d9ff9a0ec3b71043 ]

The values in the protocol registers are two bytes wide.  However, when
parsing the register loads, the code currently uses the larger 16-byte
size of a `union nf_inet_addr`.  Change it to use the (correct) size of
a `union nf_conntrack_man_proto` instead.

Fixes: 78ee2ed32535 ("netfilter: nf_tables: introduce nft_validate_register_load()")
Signed-off-by: Jeremy Sowden <jeremy@azazel.net>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nft_nat.c b/net/netfilter/nft_nat.c
index e5fd6995e4bf30fd7ef019c49d2f3a29c10cf895..353c090f889176f58e56183879efa31d5f0e2ef7 100644 (file)
--- a/net/netfilter/nft_nat.c
+++ b/net/netfilter/nft_nat.c
@@ -226,7 +226,7 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
                priv->flags |= NF_NAT_RANGE_MAP_IPS;
        }
 
-       plen = sizeof_field(struct nf_nat_range, min_addr.all);
+       plen = sizeof_field(struct nf_nat_range, min_proto.all);
        if (tb[NFTA_NAT_REG_PROTO_MIN]) {
                err = nft_parse_register_load(tb[NFTA_NAT_REG_PROTO_MIN],
                                              &priv->sreg_proto_min, plen);