[IPV6] NDISC: Calculate packet length correctly for allocation.

MAX_HEADER does not include the ipv6 header length in it,
so we need to add it in explicitly.

With help from YOSHIFUJI Hideaki.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 4 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 73eb8c33e9f0..89d527ebd7f6 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -472,7 +472,9 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
                         inc_opt = 0;
         }
 
-        skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev),
+        skb = sock_alloc_send_skb(sk,
+                                  (MAX_HEADER + sizeof(struct ipv6hdr) +
+                                   len + LL_RESERVED_SPACE(dev)),
                                   1, &err);
 
         if (skb == NULL) {
@@ -561,7 +563,9 @@ void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
         if (send_llinfo)
                 len += ndisc_opt_addr_space(dev);
 
-        skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev),
+        skb = sock_alloc_send_skb(sk,
+                                  (MAX_HEADER + sizeof(struct ipv6hdr) +
+                                   len + LL_RESERVED_SPACE(dev)),
                                   1, &err);
         if (skb == NULL) {
                 ND_PRINTK0(KERN_ERR
@@ -636,7 +640,9 @@ void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
         if (dev->addr_len)
                 len += ndisc_opt_addr_space(dev);
 
-        skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev),
+        skb = sock_alloc_send_skb(sk,
+                                  (MAX_HEADER + sizeof(struct ipv6hdr) +
+                                   len + LL_RESERVED_SPACE(dev)),
                                   1, &err);
         if (skb == NULL) {
                 ND_PRINTK0(KERN_ERR
@@ -1446,7 +1452,9 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
         rd_len &= ~0x7;
         len += rd_len;
 
-        buff = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev),
+        buff = sock_alloc_send_skb(sk,
+                                   (MAX_HEADER + sizeof(struct ipv6hdr) +
+                                    len + LL_RESERVED_SPACE(dev)),
                                    1, &err);
         if (buff == NULL) {
                 ND_PRINTK0(KERN_ERR