diff options
| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-02-02 00:05:23 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2024-02-07 22:02:52 +0100 |
| commit | d694b754894c93fb4d71a7f3699439dec111decc (patch) | |
| tree | f264d8af0545c363bbf1f6d14fd2fbd163266760 /net/netfilter | |
| parent | 292781c3c5485ce33bd22b2ef1b2bed709b4d672 (diff) | |
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>
Diffstat (limited to 'net/netfilter')
| -rw-r--r-- | net/netfilter/nft_compat.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c index ed71d5ecbe0a..1f9474fefe84 100644 --- 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; } |