[4.2.y-ckt,164/211] net: fix percpu memory leaks

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index 53eead2..ac42bbb 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -108,7 +108,15 @@  struct inet_frags {
 int inet_frags_init(struct inet_frags *);
 void inet_frags_fini(struct inet_frags *);
 
-void inet_frags_init_net(struct netns_frags *nf);
+static inline int inet_frags_init_net(struct netns_frags *nf)
+{
+	return percpu_counter_init(&nf->mem, 0, GFP_KERNEL);
+}
+static inline void inet_frags_uninit_net(struct netns_frags *nf)
+{
+	percpu_counter_destroy(&nf->mem);
+}
+
 void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
 
 void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
@@ -154,11 +162,6 @@  static inline void add_frag_mem_limit(struct netns_frags *nf, int i)
 	__percpu_counter_add(&nf->mem, i, frag_percpu_counter_batch);
 }
 
-static inline void init_frag_mem_limit(struct netns_frags *nf)
-{
-	percpu_counter_init(&nf->mem, 0, GFP_KERNEL);
-}
-
 static inline unsigned int sum_frag_mem_limit(struct netns_frags *nf)
 {
 	unsigned int res;
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index 214d44a..9fa1d39 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -523,14 +523,19 @@  static int __net_init lowpan_frags_init_net(struct net *net)
 {
 	struct netns_ieee802154_lowpan *ieee802154_lowpan =
 		net_ieee802154_lowpan(net);
+	int res;
 
 	ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
 	ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH;
 	ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT;
 
-	inet_frags_init_net(&ieee802154_lowpan->frags);
-
-	return lowpan_frags_ns_sysctl_register(net);
+	res = inet_frags_init_net(&ieee802154_lowpan->frags);
+	if (res)
+		return res;
+	res = lowpan_frags_ns_sysctl_register(net);
+	if (res)
+		inet_frags_uninit_net(&ieee802154_lowpan->frags);
+	return res;
 }
 
 static void __net_exit lowpan_frags_exit_net(struct net *net)
diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c
index d0a7c03..fe144da 100644
--- a/net/ipv4/inet_fragment.c
+++ b/net/ipv4/inet_fragment.c
@@ -209,12 +209,6 @@  int inet_frags_init(struct inet_frags *f)
 }
 EXPORT_SYMBOL(inet_frags_init);
 
-void inet_frags_init_net(struct netns_frags *nf)
-{
-	init_frag_mem_limit(nf);
-}
-EXPORT_SYMBOL(inet_frags_init_net);
-
 void inet_frags_fini(struct inet_frags *f)
 {
 	cancel_work_sync(&f->frags_work);
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 921138f..753d0b4 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -845,6 +845,8 @@  static void __init ip4_frags_ctl_register(void)
 
 static int __net_init ipv4_frags_init_net(struct net *net)
 {
+	int res;
+
 	/* Fragment cache limits.
 	 *
 	 * The fragment memory accounting code, (tries to) account for
@@ -868,9 +870,13 @@  static int __net_init ipv4_frags_init_net(struct net *net)
 	 */
 	net->ipv4.frags.timeout = IP_FRAG_TIME;
 
-	inet_frags_init_net(&net->ipv4.frags);
-
-	return ip4_frags_ns_ctl_register(net);
+	res = inet_frags_init_net(&net->ipv4.frags);
+	if (res)
+		return res;
+	res = ip4_frags_ns_ctl_register(net);
+	if (res)
+		inet_frags_uninit_net(&net->ipv4.frags);
+	return res;
 }
 
 static void __net_exit ipv4_frags_exit_net(struct net *net)
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index 2a4682c..a73653b 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -649,12 +649,18 @@  void nf_ct_frag6_consume_orig(struct sk_buff *skb)
 
 static int nf_ct_net_init(struct net *net)
 {
+	int res;
+
 	net->nf_frag.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
 	net->nf_frag.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
 	net->nf_frag.frags.timeout = IPV6_FRAG_TIMEOUT;
-	inet_frags_init_net(&net->nf_frag.frags);
-
-	return nf_ct_frag6_sysctl_register(net);
+	res = inet_frags_init_net(&net->nf_frag.frags);
+	if (res)
+		return res;
+	res = nf_ct_frag6_sysctl_register(net);
+	if (res)
+		inet_frags_uninit_net(&net->nf_frag.frags);
+	return res;
 }
 
 static void nf_ct_net_exit(struct net *net)
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 04013a9..45f5ae5 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -710,13 +710,19 @@  static void ip6_frags_sysctl_unregister(void)
 
 static int __net_init ipv6_frags_init_net(struct net *net)
 {
+	int res;
+
 	net->ipv6.frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
 	net->ipv6.frags.low_thresh = IPV6_FRAG_LOW_THRESH;
 	net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT;
 
-	inet_frags_init_net(&net->ipv6.frags);
-
-	return ip6_frags_ns_sysctl_register(net);
+	res = inet_frags_init_net(&net->ipv6.frags);
+	if (res)
+		return res;
+	res = ip6_frags_ns_sysctl_register(net);
+	if (res)
+		inet_frags_uninit_net(&net->ipv6.frags);
+	return res;
 }
 
 static void __net_exit ipv6_frags_exit_net(struct net *net)