linux-kernel - [PATCH 3.16.y-ckt 002/165] netfilter: nf_tables: fix leaks in error path of nf_tables

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Message-Id: <1427292138-7021-3-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 25 Mar 2015 13:59:35 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 002/165] netfilter: nf_tables: fix leaks in error path of nf_tables_newchain()

3.16.7-ckt9 -stable review patch.  If anyone has any objections, please let me know.

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

From: Pablo Neira Ayuso <pablo@...filter.org>

commit f5553c19ff9058136e7082c0b1f4268e705ea538 upstream.

Release statistics and module refcount on memory allocation problems.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/netfilter/nf_tables_api.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index fe551ca01a98..e1cf0f89748d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1034,8 +1034,10 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
 		nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
 		trans = nft_trans_alloc(&ctx, NFT_MSG_NEWCHAIN,
 					sizeof(struct nft_trans_chain));
-		if (trans == NULL)
+		if (trans == NULL) {
+			free_percpu(stats);
 			return -ENOMEM;
+		}
 
 		nft_trans_chain_stats(trans) = stats;
 		nft_trans_chain_update(trans) = true;
@@ -1091,8 +1093,10 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
 		hookfn = type->hooks[hooknum];
 
 		basechain = kzalloc(sizeof(*basechain), GFP_KERNEL);
-		if (basechain == NULL)
+		if (basechain == NULL) {
+			module_put(type->owner);
 			return -ENOMEM;
+		}
 
 		if (nla[NFTA_CHAIN_COUNTERS]) {
 			stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
--
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