From: YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@linux-ipv6.org>
Date: Fri, 18 Jan 2013 02:05:03 +0000 (+0000)
Subject: ndisc: Check NS message length before access.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=115b0aa6b444e8dd89b7f67b77b8c472763fbc1a;p=linux-beck.git

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 429622d74705..350f86005c13 100644
--- 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;