Merge tag 'sysctl-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux

Pull sysctl updates from Luis Chamberlain:
 "Long ago we set out to remove the kitchen sink on kernel/sysctl.c
  arrays and placings sysctls to their own sybsystem or file to help
  avoid merge conflicts. Matthew Wilcox pointed out though that if we're
  going to do that we might as well also *save* space while at it and
  try to remove the extra last sysctl entry added at the end of each
  array, a sentintel, instead of bloating the kernel by adding a new
  sentinel with each array moved.

  Doing that was not so trivial, and has required slowing down the moves
  of kernel/sysctl.c arrays and measuring the impact on size by each new
  move.

  The complex part of the effort to help reduce the size of each sysctl
  is being done by the patient work of el señor Don Joel Granados. A lot
  of this is truly painful code refactoring and testing and then trying
  to measure the savings of each move and removing the sentinels.
  Although Joel already has code which does most of this work,
  experience with sysctl moves in the past shows is we need to be
  careful due to the slew of odd build failures that are possible due to
  the amount of random Kconfig options sysctls use.

  To that end Joel's work is split by first addressing the major
  housekeeping needed to remove the sentinels, which is part of this
  merge request. The rest of the work to actually remove the sentinels
  will be done later in future kernel releases.

  The preliminary math is showing this will all help reduce the overall
  build time size of the kernel and run time memory consumed by the
  kernel by about ~64 bytes per array where we are able to remove each
  sentinel in the future. That also means there is no more bloating the
  kernel with the extra ~64 bytes per array moved as no new sentinels
  are created"

* tag 'sysctl-6.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux:
  sysctl: Use ctl_table_size as stopping criteria for list macro
  sysctl: SIZE_MAX->ARRAY_SIZE in register_net_sysctl
  vrf: Update to register_net_sysctl_sz
  networking: Update to register_net_sysctl_sz
  netfilter: Update to register_net_sysctl_sz
  ax.25: Update to register_net_sysctl_sz
  sysctl: Add size to register_net_sysctl function
  sysctl: Add size arg to __register_sysctl_init
  sysctl: Add size to register_sysctl
  sysctl: Add a size arg to __register_sysctl_table
  sysctl: Add size argument to init_header
  sysctl: Add ctl_table_size to ctl_table_header
  sysctl: Use ctl_table_header in list_for_each_table_entry
  sysctl: Prefer ctl_table_header in proc_sysctl

30 files changed, 131 insertions, 51 deletions

diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c
index 2154d004d3dc..db66e11e7fe8 100644
--- a/net/ax25/sysctl_net_ax25.c
+++ b/net/ax25/sysctl_net_ax25.c
@@ -159,7 +159,8 @@ int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
 		table[k].data = &ax25_dev->values[k];
 
 	snprintf(path, sizeof(path), "net/ax25/%s", ax25_dev->dev->name);
-	ax25_dev->sysheader = register_net_sysctl(&init_net, path, table);
+	ax25_dev->sysheader = register_net_sysctl_sz(&init_net, path, table,
+						     ARRAY_SIZE(ax25_param_table));
 	if (!ax25_dev->sysheader) {
 		kfree(table);
 		return -ENOMEM;
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index 1a801fab9543..15186247b59a 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -1135,7 +1135,8 @@ static int br_netfilter_sysctl_init_net(struct net *net)
 
 	br_netfilter_sysctl_default(brnet);
 
-	brnet->ctl_hdr = register_net_sysctl(net, "net/bridge", table);
+	brnet->ctl_hdr = register_net_sysctl_sz(net, "net/bridge", table,
+						ARRAY_SIZE(brnf_table));
 	if (!brnet->ctl_hdr) {
 		if (!net_eq(net, &init_net))
 			kfree(table);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index ddd0f32de20e..6b76cd103195 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -3779,6 +3779,7 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 	const char *dev_name_source;
 	char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ];
 	char *p_name;
+	size_t neigh_vars_size;
 
 	t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL_ACCOUNT);
 	if (!t)
@@ -3790,11 +3791,13 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 		t->neigh_vars[i].extra2 = p;
 	}
 
+	neigh_vars_size = ARRAY_SIZE(t->neigh_vars);
 	if (dev) {
 		dev_name_source = dev->name;
 		/* Terminate the table early */
 		memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0,
 		       sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL]));
+		neigh_vars_size = NEIGH_VAR_BASE_REACHABLE_TIME_MS + 1;
 	} else {
 		struct neigh_table *tbl = p->tbl;
 		dev_name_source = "default";
@@ -3841,8 +3844,9 @@ int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
 
 	snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s",
 		p_name, dev_name_source);
-	t->sysctl_header =
-		register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars);
+	t->sysctl_header = register_net_sysctl_sz(neigh_parms_net(p),
+						  neigh_path, t->neigh_vars,
+						  neigh_vars_size);
 	if (!t->sysctl_header)
 		goto free;
 
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index 782273bb93c2..03f1edb948d7 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -712,7 +712,8 @@ static __net_init int sysctl_core_net_init(struct net *net)
 			tmp->data += (char *)net - (char *)&init_net;
 	}
 
-	net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl);
+	net->core.sysctl_hdr = register_net_sysctl_sz(net, "net/core", tbl,
+						      ARRAY_SIZE(netns_core_table));
 	if (net->core.sysctl_hdr == NULL)
 		goto err_reg;
 
diff --git a/net/ieee802154/6lowpan/reassembly.c b/net/ieee802154/6lowpan/reassembly.c
index a91283d1e5bf..6dd960ec558c 100644
--- a/net/ieee802154/6lowpan/reassembly.c
+++ b/net/ieee802154/6lowpan/reassembly.c
@@ -360,6 +360,7 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
 	struct ctl_table_header *hdr;
 	struct netns_ieee802154_lowpan *ieee802154_lowpan =
 		net_ieee802154_lowpan(net);
+	size_t table_size = ARRAY_SIZE(lowpan_frags_ns_ctl_table);
 
 	table = lowpan_frags_ns_ctl_table;
 	if (!net_eq(net, &init_net)) {
@@ -369,8 +370,10 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
 			goto err_alloc;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns)
+		if (net->user_ns != &init_user_ns) {
 			table[0].procname = NULL;
+			table_size = 0;
+		}
 	}
 
 	table[0].data	= &ieee802154_lowpan->fqdir->high_thresh;
@@ -379,7 +382,8 @@ static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
 	table[1].extra2	= &ieee802154_lowpan->fqdir->high_thresh;
 	table[2].data	= &ieee802154_lowpan->fqdir->timeout;
 
-	hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table);
+	hdr = register_net_sysctl_sz(net, "net/ieee802154/6lowpan", table,
+				     table_size);
 	if (hdr == NULL)
 		goto err_reg;
 
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index c3658b8755bc..9cf64ee47dd2 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2737,7 +2737,8 @@ static __net_init int devinet_init_net(struct net *net)
 		goto err_reg_dflt;
 
 	err = -ENOMEM;
-	forw_hdr = register_net_sysctl(net, "net/ipv4", tbl);
+	forw_hdr = register_net_sysctl_sz(net, "net/ipv4", tbl,
+					  ARRAY_SIZE(ctl_forward_entry));
 	if (!forw_hdr)
 		goto err_reg_ctl;
 	net->ipv4.forw_hdr = forw_hdr;
diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 69c00ffdcf3e..a4941f53b523 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -615,7 +615,8 @@ static int __net_init ip4_frags_ns_ctl_register(struct net *net)
 	table[2].data	= &net->ipv4.fqdir->timeout;
 	table[3].data	= &net->ipv4.fqdir->max_dist;
 
-	hdr = register_net_sysctl(net, "net/ipv4", table);
+	hdr = register_net_sysctl_sz(net, "net/ipv4", table,
+				     ARRAY_SIZE(ip4_frags_ns_ctl_table));
 	if (!hdr)
 		goto err_reg;
 
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a4e153dd615b..d8c99bdc6170 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3592,6 +3592,7 @@ static struct ctl_table ipv4_route_netns_table[] = {
 static __net_init int sysctl_route_net_init(struct net *net)
 {
 	struct ctl_table *tbl;
+	size_t table_size = ARRAY_SIZE(ipv4_route_netns_table);
 
 	tbl = ipv4_route_netns_table;
 	if (!net_eq(net, &init_net)) {
@@ -3603,8 +3604,10 @@ static __net_init int sysctl_route_net_init(struct net *net)
 
 		/* Don't export non-whitelisted sysctls to unprivileged users */
 		if (net->user_ns != &init_user_ns) {
-			if (tbl[0].procname != ipv4_route_flush_procname)
+			if (tbl[0].procname != ipv4_route_flush_procname) {
 				tbl[0].procname = NULL;
+				table_size = 0;
+			}
 		}
 
 		/* Update the variables to point into the current struct net
@@ -3615,7 +3618,8 @@ static __net_init int sysctl_route_net_init(struct net *net)
 	}
 	tbl[0].extra1 = net;
 
-	net->ipv4.route_hdr = register_net_sysctl(net, "net/ipv4/route", tbl);
+	net->ipv4.route_hdr = register_net_sysctl_sz(net, "net/ipv4/route",
+						     tbl, table_size);
 	if (!net->ipv4.route_hdr)
 		goto err_reg;
 	return 0;
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 2afb0870648b..6ac890b4073f 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -1519,7 +1519,8 @@ static __net_init int ipv4_sysctl_init_net(struct net *net)
 		}
 	}
 
-	net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
+	net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
+						    ARRAY_SIZE(ipv4_net_table));
 	if (!net->ipv4.ipv4_hdr)
 		goto err_reg;
 
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index cdcc0f6b4f0a..c33bca2c3841 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -169,7 +169,8 @@ static __net_init int xfrm4_net_sysctl_init(struct net *net)
 		table[0].data = &net->xfrm.xfrm4_dst_ops.gc_thresh;
 	}
 
-	hdr = register_net_sysctl(net, "net/ipv4", table);
+	hdr = register_net_sysctl_sz(net, "net/ipv4", table,
+				     ARRAY_SIZE(xfrm4_policy_table));
 	if (!hdr)
 		goto err_reg;
 
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 47d1dd8501b7..967913ad65e5 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -7135,7 +7135,8 @@ static int __addrconf_sysctl_register(struct net *net, char *dev_name,
 
 	snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
 
-	p->sysctl_header = register_net_sysctl(net, path, table);
+	p->sysctl_header = register_net_sysctl_sz(net, path, table,
+						  ARRAY_SIZE(addrconf_sysctl));
 	if (!p->sysctl_header)
 		goto free;
 
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 6d88f5248c1f..93a594a901d1 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -1227,4 +1227,9 @@ struct ctl_table * __net_init ipv6_icmp_sysctl_init(struct net *net)
 	}
 	return table;
 }
+
+size_t ipv6_icmp_sysctl_table_size(void)
+{
+	return ARRAY_SIZE(ipv6_icmp_table_template);
+}
 #endif
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index d13240f13607..b2dd48911c8d 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -87,7 +87,8 @@ static int nf_ct_frag6_sysctl_register(struct net *net)
 	table[2].data	= &nf_frag->fqdir->high_thresh;
 	table[2].extra1	= &nf_frag->fqdir->low_thresh;
 
-	hdr = register_net_sysctl(net, "net/netfilter", table);
+	hdr = register_net_sysctl_sz(net, "net/netfilter", table,
+				     ARRAY_SIZE(nf_ct_frag6_sysctl_table));
 	if (hdr == NULL)
 		goto err_reg;
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 5bc8a28e67f9..5ebc47da1000 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -470,7 +470,8 @@ static int __net_init ip6_frags_ns_sysctl_register(struct net *net)
 	table[1].extra2	= &net->ipv6.fqdir->high_thresh;
 	table[2].data	= &net->ipv6.fqdir->timeout;
 
-	hdr = register_net_sysctl(net, "net/ipv6", table);
+	hdr = register_net_sysctl_sz(net, "net/ipv6", table,
+				     ARRAY_SIZE(ip6_frags_ns_ctl_table));
 	if (!hdr)
 		goto err_reg;
 
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 846aec8e0093..d15a9e3aa24a 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -6453,6 +6453,15 @@ struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
 
 	return table;
 }
+
+size_t ipv6_route_sysctl_table_size(struct net *net)
+{
+	/* Don't export sysctls to unprivileged users */
+	if (net->user_ns != &init_user_ns)
+		return 1;
+
+	return ARRAY_SIZE(ipv6_route_table_template);
+}
 #endif
 
 static int __net_init ip6_route_net_init(struct net *net)
diff --git a/net/ipv6/sysctl_net_ipv6.c b/net/ipv6/sysctl_net_ipv6.c
index 94a0a294c6a1..888676163e90 100644
--- a/net/ipv6/sysctl_net_ipv6.c
+++ b/net/ipv6/sysctl_net_ipv6.c
@@ -275,17 +275,23 @@ static int __net_init ipv6_sysctl_net_init(struct net *net)
 	if (!ipv6_icmp_table)
 		goto out_ipv6_route_table;
 
-	net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
+	net->ipv6.sysctl.hdr = register_net_sysctl_sz(net, "net/ipv6",
+						      ipv6_table,
+						      ARRAY_SIZE(ipv6_table_template));
 	if (!net->ipv6.sysctl.hdr)
 		goto out_ipv6_icmp_table;
 
-	net->ipv6.sysctl.route_hdr =
-		register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
+	net->ipv6.sysctl.route_hdr = register_net_sysctl_sz(net,
+							    "net/ipv6/route",
+							    ipv6_route_table,
+							    ipv6_route_sysctl_table_size(net));
 	if (!net->ipv6.sysctl.route_hdr)
 		goto out_unregister_ipv6_table;
 
-	net->ipv6.sysctl.icmp_hdr =
-		register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
+	net->ipv6.sysctl.icmp_hdr = register_net_sysctl_sz(net,
+							   "net/ipv6/icmp",
+							   ipv6_icmp_table,
+							   ipv6_icmp_sysctl_table_size());
 	if (!net->ipv6.sysctl.icmp_hdr)
 		goto out_unregister_route_table;
 
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 188224a76685..41a680c76d2e 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -201,7 +201,8 @@ static int __net_init xfrm6_net_sysctl_init(struct net *net)
 		table[0].data = &net->xfrm.xfrm6_dst_ops.gc_thresh;
 	}
 
-	hdr = register_net_sysctl(net, "net/ipv6", table);
+	hdr = register_net_sysctl_sz(net, "net/ipv6", table,
+				     ARRAY_SIZE(xfrm6_policy_table));
 	if (!hdr)
 		goto err_reg;
 
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index bf6e81d56263..1af29af65388 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -1419,7 +1419,8 @@ static int mpls_dev_sysctl_register(struct net_device *dev,
 
 	snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name);
 
-	mdev->sysctl = register_net_sysctl(net, path, table);
+	mdev->sysctl = register_net_sysctl_sz(net, path, table,
+					      ARRAY_SIZE(mpls_dev_table));
 	if (!mdev->sysctl)
 		goto free;
 
@@ -2689,7 +2690,8 @@ static int mpls_net_init(struct net *net)
 	for (i = 0; i < ARRAY_SIZE(mpls_table) - 1; i++)
 		table[i].data = (char *)net + (uintptr_t)table[i].data;
 
-	net->mpls.ctl = register_net_sysctl(net, "net/mpls", table);
+	net->mpls.ctl = register_net_sysctl_sz(net, "net/mpls", table,
+					       ARRAY_SIZE(mpls_table));
 	if (net->mpls.ctl == NULL) {
 		kfree(table);
 		return -ENOMEM;
diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c
index c46c22a84d23..e72b518c5d02 100644
--- a/net/mptcp/ctrl.c
+++ b/net/mptcp/ctrl.c
@@ -164,7 +164,8 @@ static int mptcp_pernet_new_table(struct net *net, struct mptcp_pernet *pernet)
 	table[5].data = &pernet->pm_type;
 	table[6].data = &pernet->scheduler;
 
-	hdr = register_net_sysctl(net, MPTCP_SYSCTL_PATH, table);
+	hdr = register_net_sysctl_sz(net, MPTCP_SYSCTL_PATH, table,
+				     ARRAY_SIZE(mptcp_sysctl_table));
 	if (!hdr)
 		goto err_reg;
 
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 4bb0d90eca1c..143a341bbc0a 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -4269,6 +4269,7 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
 	struct net *net = ipvs->net;
 	struct ctl_table *tbl;
 	int idx, ret;
+	size_t ctl_table_size = ARRAY_SIZE(vs_vars);
 
 	atomic_set(&ipvs->dropentry, 0);
 	spin_lock_init(&ipvs->dropentry_lock);
@@ -4285,8 +4286,10 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns)
+		if (net->user_ns != &init_user_ns) {
 			tbl[0].procname = NULL;
+			ctl_table_size = 0;
+		}
 	} else
 		tbl = vs_vars;
 	/* Initialize sysctl defaults */
@@ -4357,7 +4360,8 @@ static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
 #endif
 
 	ret = -ENOMEM;
-	ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
+	ipvs->sysctl_hdr = register_net_sysctl_sz(net, "net/ipv4/vs", tbl,
+						  ctl_table_size);
 	if (!ipvs->sysctl_hdr)
 		goto err;
 	ipvs->sysctl_tbl = tbl;
diff --git a/net/netfilter/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 1b87214d385e..cf78ba4ce5ff 100644
--- a/net/netfilter/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
@@ -550,6 +550,7 @@ static struct ip_vs_scheduler ip_vs_lblc_scheduler = {
 static int __net_init __ip_vs_lblc_init(struct net *net)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
+	size_t vars_table_size = ARRAY_SIZE(vs_vars_table);
 
 	if (!ipvs)
 		return -ENOENT;
@@ -562,16 +563,19 @@ static int __net_init __ip_vs_lblc_init(struct net *net)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns)
+		if (net->user_ns != &init_user_ns) {
 			ipvs->lblc_ctl_table[0].procname = NULL;
+			vars_table_size = 0;
+		}
 
 	} else
 		ipvs->lblc_ctl_table = vs_vars_table;
 	ipvs->sysctl_lblc_expiration = DEFAULT_EXPIRATION;
 	ipvs->lblc_ctl_table[0].data = &ipvs->sysctl_lblc_expiration;
 
-	ipvs->lblc_ctl_header =
-		register_net_sysctl(net, "net/ipv4/vs", ipvs->lblc_ctl_table);
+	ipvs->lblc_ctl_header = register_net_sysctl_sz(net, "net/ipv4/vs",
+						       ipvs->lblc_ctl_table,
+						       vars_table_size);
 	if (!ipvs->lblc_ctl_header) {
 		if (!net_eq(net, &init_net))
 			kfree(ipvs->lblc_ctl_table);
diff --git a/net/netfilter/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index ad8f5fea6d3a..9eddf118b40e 100644
--- a/net/netfilter/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
@@ -736,6 +736,7 @@ static struct ip_vs_scheduler ip_vs_lblcr_scheduler =
 static int __net_init __ip_vs_lblcr_init(struct net *net)
 {
 	struct netns_ipvs *ipvs = net_ipvs(net);
+	size_t vars_table_size = ARRAY_SIZE(vs_vars_table);
 
 	if (!ipvs)
 		return -ENOENT;
@@ -748,15 +749,18 @@ static int __net_init __ip_vs_lblcr_init(struct net *net)
 			return -ENOMEM;
 
 		/* Don't export sysctls to unprivileged users */
-		if (net->user_ns != &init_user_ns)
+		if (net->user_ns != &init_user_ns) {
 			ipvs->lblcr_ctl_table[0].procname = NULL;
+			vars_table_size = 0;
+		}
 	} else
 		ipvs->lblcr_ctl_table = vs_vars_table;
 	ipvs->sysctl_lblcr_expiration = DEFAULT_EXPIRATION;
 	ipvs->lblcr_ctl_table[0].data = &ipvs->sysctl_lblcr_expiration;
 
-	ipvs->lblcr_ctl_header =
-		register_net_sysctl(net, "net/ipv4/vs", ipvs->lblcr_ctl_table);
+	ipvs->lblcr_ctl_header = register_net_sysctl_sz(net, "net/ipv4/vs",
+							ipvs->lblcr_ctl_table,
+							vars_table_size);
 	if (!ipvs->lblcr_ctl_header) {
 		if (!net_eq(net, &init_net))
 			kfree(ipvs->lblcr_ctl_table);
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 169e16fc2bce..0ee98ce5b816 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -1106,7 +1106,9 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net)
 		table[NF_SYSCTL_CT_BUCKETS].mode = 0444;
 	}
 
-	cnet->sysctl_header = register_net_sysctl(net, "net/netfilter", table);
+	cnet->sysctl_header = register_net_sysctl_sz(net, "net/netfilter",
+						     table,
+						     ARRAY_SIZE(nf_ct_sysctl_table));
 	if (!cnet->sysctl_header)
 		goto out_unregister_netfilter;
 
diff --git a/net/netfilter/nf_log.c b/net/netfilter/nf_log.c
index 8a29290149bd..8cc52d2bd31b 100644
--- a/net/netfilter/nf_log.c
+++ b/net/netfilter/nf_log.c
@@ -487,9 +487,10 @@ static int netfilter_log_sysctl_init(struct net *net)
 	for (i = NFPROTO_UNSPEC; i < NFPROTO_NUMPROTO; i++)
 		table[i].extra2 = net;
 
-	net->nf.nf_log_dir_header = register_net_sysctl(net,
-						"net/netfilter/nf_log",
-						table);
+	net->nf.nf_log_dir_header = register_net_sysctl_sz(net,
+							   "net/netfilter/nf_log",
+							   table,
+							   ARRAY_SIZE(nf_log_sysctl_table));
 	if (!net->nf.nf_log_dir_header)
 		goto err_reg;
 
diff --git a/net/rds/tcp.c b/net/rds/tcp.c
index c5b86066ff66..2dba7505b414 100644
--- a/net/rds/tcp.c
+++ b/net/rds/tcp.c
@@ -565,7 +565,8 @@ static __net_init int rds_tcp_init_net(struct net *net)
 	}
 	tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size;
 	tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size;
-	rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl);
+	rtn->rds_tcp_sysctl = register_net_sysctl_sz(net, "net/rds/tcp", tbl,
+						     ARRAY_SIZE(rds_tcp_sysctl_table));
 	if (!rtn->rds_tcp_sysctl) {
 		pr_warn("could not register sysctl\n");
 		err = -ENOMEM;
diff --git a/net/sctp/sysctl.c b/net/sctp/sysctl.c
index a7a9136198fd..f65d6f92afcb 100644
--- a/net/sctp/sysctl.c
+++ b/net/sctp/sysctl.c
@@ -612,7 +612,9 @@ int sctp_sysctl_net_register(struct net *net)
 	table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
 	table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
 
-	net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
+	net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
+							 table,
+							 ARRAY_SIZE(sctp_net_table));
 	if (net->sctp.sysctl_header == NULL) {
 		kfree(table);
 		return -ENOMEM;
diff --git a/net/smc/smc_sysctl.c b/net/smc/smc_sysctl.c
index 0b2a957ca5f5..5cbc18c6e62b 100644
--- a/net/smc/smc_sysctl.c
+++ b/net/smc/smc_sysctl.c
@@ -87,7 +87,8 @@ int __net_init smc_sysctl_net_init(struct net *net)
 			table[i].data += (void *)net - (void *)&init_net;
 	}
 
-	net->smc.smc_hdr = register_net_sysctl(net, "net/smc", table);
+	net->smc.smc_hdr = register_net_sysctl_sz(net, "net/smc", table,
+						  ARRAY_SIZE(smc_table));
 	if (!net->smc.smc_hdr)
 		goto err_reg;
 
diff --git a/net/sysctl_net.c b/net/sysctl_net.c
index 4b45ed631eb8..051ed5f6fc93 100644
--- a/net/sysctl_net.c
+++ b/net/sysctl_net.c
@@ -101,7 +101,7 @@ __init int net_sysctl_init(void)
 	 * registering "/proc/sys/net" as an empty directory not in a
 	 * network namespace.
 	 */
-	net_header = register_sysctl("net", empty);
+	net_header = register_sysctl_sz("net", empty, 0);
 	if (!net_header)
 		goto out;
 	ret = register_pernet_subsys(&sysctl_pernet_ops);
@@ -122,12 +122,13 @@ out1:
  *    allocated.
  */
 static void ensure_safe_net_sysctl(struct net *net, const char *path,
-				   struct ctl_table *table)
+				   struct ctl_table *table, size_t table_size)
 {
 	struct ctl_table *ent;
 
 	pr_debug("Registering net sysctl (net %p): %s\n", net, path);
-	for (ent = table; ent->procname; ent++) {
+	ent = table;
+	for (size_t i = 0; i < table_size && ent->procname; ent++, i++) {
 		unsigned long addr;
 		const char *where;
 
@@ -160,15 +161,24 @@ static void ensure_safe_net_sysctl(struct net *net, const char *path,
 	}
 }
 
-struct ctl_table_header *register_net_sysctl(struct net *net,
-	const char *path, struct ctl_table *table)
+struct ctl_table_header *register_net_sysctl_sz(struct net *net,
+						const char *path,
+						struct ctl_table *table,
+						size_t table_size)
 {
+	int count;
+	struct ctl_table *entry;
+
 	if (!net_eq(net, &init_net))
-		ensure_safe_net_sysctl(net, path, table);
+		ensure_safe_net_sysctl(net, path, table, table_size);
+
+	entry = table;
+	for (count = 0 ; count < table_size && entry->procname; entry++, count++)
+		;
 
-	return __register_sysctl_table(&net->sysctls, path, table);
+	return __register_sysctl_table(&net->sysctls, path, table, count);
 }
-EXPORT_SYMBOL_GPL(register_net_sysctl);
+EXPORT_SYMBOL_GPL(register_net_sysctl_sz);
 
 void unregister_net_sysctl_table(struct ctl_table_header *header)
 {
diff --git a/net/unix/sysctl_net_unix.c b/net/unix/sysctl_net_unix.c
index 500129aa710c..3e84b31c355a 100644
--- a/net/unix/sysctl_net_unix.c
+++ b/net/unix/sysctl_net_unix.c
@@ -36,7 +36,8 @@ int __net_init unix_sysctl_register(struct net *net)
 		table[0].data = &net->unx.sysctl_max_dgram_qlen;
 	}
 
-	net->unx.ctl = register_net_sysctl(net, "net/unix", table);
+	net->unx.ctl = register_net_sysctl_sz(net, "net/unix", table,
+					      ARRAY_SIZE(unix_table));
 	if (net->unx.ctl == NULL)
 		goto err_reg;
 
diff --git a/net/xfrm/xfrm_sysctl.c b/net/xfrm/xfrm_sysctl.c
index 0c6c5ef65f9d..7fdeafc838a7 100644
--- a/net/xfrm/xfrm_sysctl.c
+++ b/net/xfrm/xfrm_sysctl.c
@@ -44,6 +44,7 @@ static struct ctl_table xfrm_table[] = {
 int __net_init xfrm_sysctl_init(struct net *net)
 {
 	struct ctl_table *table;
+	size_t table_size = ARRAY_SIZE(xfrm_table);
 
 	__xfrm_sysctl_init(net);
 
@@ -56,10 +57,13 @@ int __net_init xfrm_sysctl_init(struct net *net)
 	table[3].data = &net->xfrm.sysctl_acq_expires;
 
 	/* Don't export sysctls to unprivileged users */
-	if (net->user_ns != &init_user_ns)
+	if (net->user_ns != &init_user_ns) {
 		table[0].procname = NULL;
+		table_size = 0;
+	}
 
-	net->xfrm.sysctl_hdr = register_net_sysctl(net, "net/core", table);
+	net->xfrm.sysctl_hdr = register_net_sysctl_sz(net, "net/core", table,
+						      table_size);
 	if (!net->xfrm.sysctl_hdr)
 		goto out_register;
 	return 0;