netfilter: nft_compat: restrict match/target protocol to u16

xt_check_{match,target} expects u16, but NFTA_RULE_COMPAT_PROTO is u32.

NLA_POLICY_MAX(NLA_BE32, 65535) cannot be used because .max in
nla_policy is s16, see 3e48be05f3c7 ("netlink: add attribute range
validation to policy").

Fixes: 0ca743a55991 ("netfilter: nf_tables: add compatibility layer for x_tables")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index ed71d5ecbe0a56b083229fcb8ddbaf7d33a28ed4..1f9474fefe84923e7769efd8ea5c703f5783e37d 100644 (file)
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -200,6 +200,7 @@ static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1]
 static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
 {
        struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
+       u32 l4proto;
        u32 flags;
        int err;
 
@@ -218,7 +219,12 @@ static int nft_parse_compat(const struct nlattr *attr, u16 *proto, bool *inv)
        if (flags & NFT_RULE_COMPAT_F_INV)
                *inv = true;
 
-       *proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
+       l4proto = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
+       if (l4proto > U16_MAX)
+               return -EINVAL;
+
+       *proto = l4proto;
+
        return 0;
 }