Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec

Steffen Klassert says:

====================
pull request (net): ipsec 2018-07-27

1) Fix PMTU handling of vti6. We update the PMTU on
   the xfrm dst_entry which is not cached anymore
   after the flowchache removal. So update the
   PMTU of the original dst_entry instead.
   From Eyal Birger.

2) Fix a leak of kernel memory to userspace.
   From Eric Dumazet.

3) Fix a possible dst_entry memleak in xfrm_lookup_route.
   From Tommi Rantala.

4) Fix a skb leak in case we can't call nlmsg_multicast
   from xfrm_nlmsg_multicast. From Florian Westphal.

5) Fix a leak of a temporary buffer in the error path of
   esp6_input. From Zhen Lei.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/esp6.c

@@ -669,8 +669,10 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
 
 	sg_init_table(sg, nfrags);
 	ret = skb_to_sgvec(skb, sg, 0, skb->len);
-	if (unlikely(ret < 0))
+	if (unlikely(ret < 0)) {
+		kfree(tmp);
 		goto out;
+	}
 
 	skb->ip_summed = CHECKSUM_NONE;
 

net/ipv6/ip6_vti.c

@@ -480,10 +480,6 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
 		goto tx_err_dst_release;
 	}
 
-	skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
-	skb_dst_set(skb, dst);
-	skb->dev = skb_dst(skb)->dev;
-
 	mtu = dst_mtu(dst);
 	if (!skb->ignore_df && skb->len > mtu) {
 		skb_dst_update_pmtu(skb, mtu);
@@ -498,9 +494,14 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
 				  htonl(mtu));
 		}
 
-		return -EMSGSIZE;
+		err = -EMSGSIZE;
+		goto tx_err_dst_release;
 	}
 
+	skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
+	skb_dst_set(skb, dst);
+	skb->dev = skb_dst(skb)->dev;
+
 	err = dst_output(t->net, skb->sk, skb);
 	if (net_xmit_eval(err) == 0) {
 		struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

net/xfrm/xfrm_policy.c

@@ -2286,6 +2286,9 @@ struct dst_entry *xfrm_lookup_route(struct net *net, struct dst_entry *dst_orig,
 	if (IS_ERR(dst) && PTR_ERR(dst) == -EREMOTE)
 		return make_blackhole(net, dst_orig->ops->family, dst_orig);
 
+	if (IS_ERR(dst))
+		dst_release(dst_orig);
+
 	return dst;
 }
 EXPORT_SYMBOL(xfrm_lookup_route);

net/xfrm/xfrm_user.c

@@ -1025,10 +1025,12 @@ static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
 {
 	struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
 
-	if (nlsk)
+	if (!nlsk) {
+		kfree_skb(skb);
+		return -EPIPE;
+	}
+
 	return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
-	else
-		return -1;
 }
 
 static inline unsigned int xfrm_spdinfo_msgsize(void)
@@ -1671,9 +1673,11 @@ static inline unsigned int userpolicy_type_attrsize(void)
 #ifdef CONFIG_XFRM_SUB_POLICY
 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
 {
-	struct xfrm_userpolicy_type upt = {
-		.type = type,
-	};
+	struct xfrm_userpolicy_type upt;
+
+	/* Sadly there are two holes in struct xfrm_userpolicy_type */
+	memset(&upt, 0, sizeof(upt));
+	upt.type = type;
 
 	return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
 }