netfilter: nft_redir: correct length for loading protocol registers

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2189550
Upstream Status: commit 1f617b6

commit 1f617b6
Author: Jeremy Sowden <jeremy@azazel.net>
Date:   Tue Mar 7 23:22:58 2023 +0000

    netfilter: nft_redir: correct length for loading protocol registers

    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: d07db98 ("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: Florian Westphal <fwestpha@redhat.com>

Author: fw-strlen

net/netfilter/nft_redir.c

@@ -48,7 +48,7 @@ static int nft_redir_init(const struct nft_ctx *ctx,
 	unsigned int plen;
 	int err;
 
-	plen = sizeof_field(struct nf_nat_range, min_addr.all);
+	plen = sizeof_field(struct nf_nat_range, min_proto.all);
 	if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
 		err = nft_parse_register_load(tb[NFTA_REDIR_REG_PROTO_MIN],
 					      &priv->sreg_proto_min, plen);