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Subject[PATCH 4.14 043/115] netfilter: fix memory leaks on netlink_dump_start error
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Westphal <fw@strlen.de>

[ Upstream commit 3e673b23b541b8e7f773b2d378d6eb99831741cd ]

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 90fd131afc565159c9e0ea742f082b337e10f8c6
("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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/netfilter/nf_conntrack_netlink.c | 26 +++++++++++++++++---------
net/netfilter/nfnetlink_acct.c | 29 +++++++++++++----------------
2 files changed, 30 insertions(+), 25 deletions(-)

--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -788,6 +788,21 @@ ctnetlink_alloc_filter(const struct nlat
#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;
@@ -1194,19 +1209,12 @@ static int ctnetlink_get_conntrack(struc

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);
}

--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -238,29 +238,33 @@ static const struct nla_policy filter_po
[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
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);
}


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