[PATCH net] udp: prevent bugcheck if filter truncates packet too much

[Michal Kubecek <mkubecek@suse.cz>]

If socket filter truncates an udp packet below the length of UDP header
in udpv6_queue_rcv_skb() or udp_queue_rcv_skb(), it will trigger a
BUG_ON in skb_pull_rcsum(). This BUG_ON (and therefore a system crash if
kernel is configured that way) can be easily enforced by an unprivileged
user which was reported as CVE-2016-6162. For a reproducer, see
http://seclists.org/oss-sec/2016/q3/8

Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
Reported-by: Marco Grassi <marco.gra@gmail.com>
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
---
 net/ipv4/udp.c | 2 ++
 net/ipv6/udp.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ca5e8ea29538..4aed8fc23d32 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1583,6 +1583,8 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 	if (sk_filter(sk, skb))
 		goto drop;
+	if (unlikely(skb->len < sizeof(struct udphdr)))
+		goto drop;
 
 	udp_csum_pull_header(skb);
 	if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 005dc82c2138..acc09705618b 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -620,6 +620,8 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
 
 	if (sk_filter(sk, skb))
 		goto drop;
+	if (unlikely(skb->len < sizeof(struct udphdr)))
+		goto drop;
 
 	udp_csum_pull_header(skb);
 	if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
-- 
2.9.0