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netfilter: fix memory leaks on netlink_dump_start error

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Shaochun Chen points out we leak dumper filter state allocations
stored in dump_control->data in case there is an error before netlink sets
cb_running (after which ->done will be called at some point).

In order to fix this, add .start functions and move allocations there.

Same pattern as used in commit 90fd131afc
("netfilter: nf_tables: move dumper state allocation into ->start").

Reported-by: shaochun chen <cscnull@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-07-31 13:41:23 +02:00 committed by Pablo Neira Ayuso
parent 4ef360dd6a
commit 3e673b23b5
2 changed files with 30 additions and 25 deletions
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26
net/netfilter/nf_conntrack_netlink.c
View File

@ -846,6 +846,21 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[])
#endif
}
static int ctnetlink_start(struct netlink_callback *cb)
{
const struct nlattr * const *cda = cb->data;
struct ctnetlink_filter *filter = NULL;
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
filter = ctnetlink_alloc_filter(cda);
if (IS_ERR(filter))
return PTR_ERR(filter);
}
cb->data = filter;
return 0;
}
static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
{
struct ctnetlink_filter *filter = data;
@ -1290,19 +1305,12 @@ static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = ctnetlink_start,
.dump = ctnetlink_dump_table,
.done = ctnetlink_done,
.data = (void *)cda,
};
if (cda[CTA_MARK] && cda[CTA_MARK_MASK]) {
struct ctnetlink_filter *filter;
filter = ctnetlink_alloc_filter(cda);
if (IS_ERR(filter))
return PTR_ERR(filter);
c.data = filter;
}
return netlink_dump_start(ctnl, skb, nlh, &c);
}

29
net/netfilter/nfnetlink_acct.c
View File

@ -238,29 +238,33 @@ static const struct nla_policy filter_policy[NFACCT_FILTER_MAX + 1] = {
[NFACCT_FILTER_VALUE] = { .type = NLA_U32 },
};
static struct nfacct_filter *
nfacct_filter_alloc(const struct nlattr * const attr)
static int nfnl_acct_start(struct netlink_callback *cb)
{
struct nfacct_filter *filter;
const struct nlattr *const attr = cb->data;
struct nlattr *tb[NFACCT_FILTER_MAX + 1];
struct nfacct_filter *filter;
int err;
if (!attr)
return 0;
err = nla_parse_nested(tb, NFACCT_FILTER_MAX, attr, filter_policy,
NULL);
if (err < 0)
return ERR_PTR(err);
return err;
if (!tb[NFACCT_FILTER_MASK] || !tb[NFACCT_FILTER_VALUE])
return ERR_PTR(-EINVAL);
return -EINVAL;
filter = kzalloc(sizeof(struct nfacct_filter), GFP_KERNEL);
if (!filter)
return ERR_PTR(-ENOMEM);
return -ENOMEM;
filter->mask = ntohl(nla_get_be32(tb[NFACCT_FILTER_MASK]));
filter->value = ntohl(nla_get_be32(tb[NFACCT_FILTER_VALUE]));
cb->data = filter;
return filter;
return 0;
}
static int nfnl_acct_get(struct net *net, struct sock *nfnl,
@ -275,18 +279,11 @@ static int nfnl_acct_get(struct net *net, struct sock *nfnl,
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = nfnl_acct_dump,
.start = nfnl_acct_start,
.done = nfnl_acct_done,
.data = (void *)tb[NFACCT_FILTER],
};
if (tb[NFACCT_FILTER]) {
struct nfacct_filter *filter;
filter = nfacct_filter_alloc(tb[NFACCT_FILTER]);
if (IS_ERR(filter))
return PTR_ERR(filter);
c.data = filter;
}
return netlink_dump_start(nfnl, skb, nlh, &c);
}