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>
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 429622d..350f860 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -671,6 +671,11 @@
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;