ndisc: Check NS message length before access.

Check message length before accessing "target" field, as we do for other types. Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
git-mirror · Jan 18, 2013 · 115b0aa · 115b0aa
1 parent 12fd84f
commit 115b0aa
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
@@ -671,6 +671,11 @@ static void ndisc_recv_ns(struct sk_buff *skb)
 	bool inc;
 	int is_router = -1;
 
+	if (skb->len < sizeof(struct nd_msg)) {
+		ND_PRINTK(2, warn, "NS: packet too short\n");
+		return;
+	}
+
 	if (ipv6_addr_is_multicast(&msg->target)) {
 		ND_PRINTK(2, warn, "NS: multicast target address\n");
 		return;