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netfilter: check return code from nla_parse_tested 

These are the only calls under net/ that do not check nla_parse_nested()
for its error code, but simply continue execution. If parsing of netlink
attributes fails, we should return with an error instead of continuing.
In nearly all of these calls we have a policy attached, that is being
type verified during nla_parse_nested(), which we would miss checking
for otherwise.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Daniel Borkmann 2013-06-12 17:54:51 +02:00 committed by Pablo Neira Ayuso
parent fedaf4ffc2
commit 130ffbc263
3 changed files with 39 additions and 13 deletions
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30
net/netfilter/nf_conntrack_netlink.c
View File

@ -828,7 +828,9 @@ ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
struct nf_conntrack_l3proto *l3proto;
int ret = 0;
nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
ret = nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
if (ret < 0)
return ret;
rcu_read_lock();
l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
@ -895,7 +897,9 @@ ctnetlink_parse_tuple(const struct nlattr * const cda[],
memset(tuple, 0, sizeof(*tuple));
nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
err = nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], tuple_nla_policy);
if (err < 0)
return err;
if (!tb[CTA_TUPLE_IP])
return -EINVAL;
@ -946,9 +950,12 @@ static inline int
ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
struct nlattr **helpinfo)
{
int err;
struct nlattr *tb[CTA_HELP_MAX+1];
nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
err = nla_parse_nested(tb, CTA_HELP_MAX, attr, help_nla_policy);
if (err < 0)
return err;
if (!tb[CTA_HELP_NAME])
return -EINVAL;
@ -1431,7 +1438,9 @@ ctnetlink_change_protoinfo(struct nf_conn *ct, const struct nlattr * const cda[]
struct nf_conntrack_l4proto *l4proto;
int err = 0;
nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
err = nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, protoinfo_policy);
if (err < 0)
return err;
rcu_read_lock();
l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
@ -1452,9 +1461,12 @@ static const struct nla_policy nat_seq_policy[CTA_NAT_SEQ_MAX+1] = {
static inline int
change_nat_seq_adj(struct nf_nat_seq *natseq, const struct nlattr * const attr)
{
int err;
struct nlattr *cda[CTA_NAT_SEQ_MAX+1];
nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
err = nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, nat_seq_policy);
if (err < 0)
return err;
if (!cda[CTA_NAT_SEQ_CORRECTION_POS])
return -EINVAL;
@ -2115,7 +2127,9 @@ ctnetlink_nfqueue_parse(const struct nlattr *attr, struct nf_conn *ct)
struct nlattr *cda[CTA_MAX+1];
int ret;
nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
ret = nla_parse_nested(cda, CTA_MAX, attr, ct_nla_policy);
if (ret < 0)
return ret;
spin_lock_bh(&nf_conntrack_lock);
ret = ctnetlink_nfqueue_parse_ct((const struct nlattr **)cda, ct);
@ -2710,7 +2724,9 @@ ctnetlink_parse_expect_nat(const struct nlattr *attr,
struct nf_conntrack_tuple nat_tuple = {};
int err;
nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
err = nla_parse_nested(tb, CTA_EXPECT_NAT_MAX, attr, exp_nat_nla_policy);
if (err < 0)
return err;
if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
return -EINVAL;

16
net/netfilter/nfnetlink_cthelper.c
View File

@ -67,9 +67,12 @@ static int
nfnl_cthelper_parse_tuple(struct nf_conntrack_tuple *tuple,
const struct nlattr *attr)
{
int err;
struct nlattr *tb[NFCTH_TUPLE_MAX+1];
nla_parse_nested(tb, NFCTH_TUPLE_MAX, attr, nfnl_cthelper_tuple_pol);
err = nla_parse_nested(tb, NFCTH_TUPLE_MAX, attr, nfnl_cthelper_tuple_pol);
if (err < 0)
return err;
if (!tb[NFCTH_TUPLE_L3PROTONUM] || !tb[NFCTH_TUPLE_L4PROTONUM])
return -EINVAL;
@ -121,9 +124,12 @@ static int
nfnl_cthelper_expect_policy(struct nf_conntrack_expect_policy *expect_policy,
const struct nlattr *attr)
{
int err;
struct nlattr *tb[NFCTH_POLICY_MAX+1];
nla_parse_nested(tb, NFCTH_POLICY_MAX, attr, nfnl_cthelper_expect_pol);
err = nla_parse_nested(tb, NFCTH_POLICY_MAX, attr, nfnl_cthelper_expect_pol);
if (err < 0)
return err;
if (!tb[NFCTH_POLICY_NAME] ||
!tb[NFCTH_POLICY_EXPECT_MAX] ||
@ -153,8 +159,10 @@ nfnl_cthelper_parse_expect_policy(struct nf_conntrack_helper *helper,
struct nf_conntrack_expect_policy *expect_policy;
struct nlattr *tb[NFCTH_POLICY_SET_MAX+1];
nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr,
nfnl_cthelper_expect_policy_set);
ret = nla_parse_nested(tb, NFCTH_POLICY_SET_MAX, attr,
nfnl_cthelper_expect_policy_set);
if (ret < 0)
return ret;
if (!tb[NFCTH_POLICY_SET_NUM])
return -EINVAL;

6
net/netfilter/nfnetlink_cttimeout.c
View File

@ -59,8 +59,10 @@ ctnl_timeout_parse_policy(struct ctnl_timeout *timeout,
if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) {
struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1];
nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
attr, l4proto->ctnl_timeout.nla_policy);
ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
attr, l4proto->ctnl_timeout.nla_policy);
if (ret < 0)
return ret;
ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net,
&timeout->data);