diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index b41c5d8b2789a5dffb519cf64d94c84cbe4e772b..a5e8d207a51b72eb1c3ae4a65bd1f825f4d7100f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3969,10 +3969,9 @@ static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf
 	struct addrconf_sysctl_table *t;
 	char *dev_name = NULL;
 
-	t = kmalloc(sizeof(*t), GFP_KERNEL);
+	t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
 	if (t == NULL)
 		return;
-	memcpy(t, &addrconf_sysctl, sizeof(*t));
 	for (i=0; t->addrconf_vars[i].data; i++) {
 		t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
 		t->addrconf_vars[i].de = NULL;
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 2d9e495cf691224dd80cfcf46d7a56f43c5358f2..12c5a4dec09e32dd37dc4181c6e5bb8d6c4d286b 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -354,10 +354,9 @@ static int ah6_input(struct xfrm_state *x, struct sk_buff *skb)
 	if (!pskb_may_pull(skb, ah_hlen))
 		goto out;
 
-	tmp_hdr = kmalloc(hdr_len, GFP_ATOMIC);
+	tmp_hdr = kmemdup(skb->nh.raw, hdr_len, GFP_ATOMIC);
 	if (!tmp_hdr)
 		goto out;
-	memcpy(tmp_hdr, skb->nh.raw, hdr_len);
 	if (ipv6_clear_mutable_options(skb->nh.ipv6h, hdr_len, XFRM_POLICY_IN))
 		goto free_out;
 	skb->nh.ipv6h->priority    = 0;
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 85f889270492a6a398499c5efaefb3df520af1f8..e05ecbb1412ddaa91777333cf358217eb3e08be7 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -624,14 +624,13 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
 		skb_shinfo(skb)->frag_list = NULL;
 		/* BUILD HEADER */
 
-		tmp_hdr = kmalloc(hlen, GFP_ATOMIC);
+		tmp_hdr = kmemdup(skb->nh.raw, hlen, GFP_ATOMIC);
 		if (!tmp_hdr) {
 			IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
 			return -ENOMEM;
 		}
 
 		*prevhdr = NEXTHDR_FRAGMENT;
-		memcpy(tmp_hdr, skb->nh.raw, hlen);
 		__skb_pull(skb, hlen);
 		fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
 		skb->nh.raw = __skb_push(skb, hlen);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 147ce499f509fd3c8564e5f3219e352c6558b287..d2170da77e5ba1b1f5294620309368bc801b1d33 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -720,10 +720,9 @@ static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval,
 		tp->md5sig_info = p;
 	}
 
-	newkey = kmalloc(cmd.tcpm_keylen, GFP_KERNEL);
+	newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
 	if (!newkey)
 		return -ENOMEM;
-	memcpy(newkey, cmd.tcpm_key, cmd.tcpm_keylen);
 	if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_MAPPED) {
 		return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3],
 					 newkey, cmd.tcpm_keylen);
@@ -1503,12 +1502,10 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
 		 * memory, then we end up not copying the key
 		 * across. Shucks.
 		 */
-		char *newkey = kmalloc(key->keylen, GFP_ATOMIC);
-		if (newkey) {
-			memcpy(newkey, key->key, key->keylen);
+		char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC);
+		if (newkey != NULL)
 			tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr,
 					  newkey, key->keylen);
-		}
 	}
 #endif