releases/4.9.72/netfilter-nfnl_cthelper-fix-memory-leak.patch

From foo@baz Thu Dec 21 09:02:40 CET 2017
From: Jeffy Chen <jeffy.chen@rock-chips.com>
Date: Tue, 21 Mar 2017 15:07:10 +0800
Subject: netfilter: nfnl_cthelper: Fix memory leak

From: Jeffy Chen <jeffy.chen@rock-chips.com>


[ Upstream commit f83bf8da1135ca635aac8f062cad3f001fcf3a26 ]

We have memory leaks of nf_conntrack_helper & expect_policy.

Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/netfilter/nfnetlink_cthelper.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/net/netfilter/nfnetlink_cthelper.c
+++ b/net/netfilter/nfnetlink_cthelper.c
@@ -216,7 +216,7 @@ nfnl_cthelper_create(const struct nlattr
 
 	ret = nfnl_cthelper_parse_expect_policy(helper, tb[NFCTH_POLICY]);
 	if (ret < 0)
-		goto err;
+		goto err1;
 
 	strncpy(helper->name, nla_data(tb[NFCTH_NAME]), NF_CT_HELPER_NAME_LEN);
 	helper->data_len = ntohl(nla_get_be32(tb[NFCTH_PRIV_DATA_LEN]));
@@ -247,10 +247,12 @@ nfnl_cthelper_create(const struct nlattr
 
 	ret = nf_conntrack_helper_register(helper);
 	if (ret < 0)
-		goto err;
+		goto err2;
 
 	return 0;
-err:
+err2:
+	kfree(helper->expect_policy);
+err1:
 	kfree(helper);
 	return ret;
 }
@@ -696,6 +698,8 @@ static int nfnl_cthelper_del(struct net
 
 			found = true;
 			nf_conntrack_helper_unregister(cur);
+			kfree(cur->expect_policy);
+			kfree(cur);
 		}
 	}
 	/* Make sure we return success if we flush and there is no helpers */
@@ -759,6 +763,8 @@ static void __exit nfnl_cthelper_exit(vo
 				continue;
 
 			nf_conntrack_helper_unregister(cur);
+			kfree(cur->expect_policy);
+			kfree(cur);
 		}
 	}
 }