From: Willem de Bruijn <willemb@google.com>
Date: Thu, 22 Dec 2016 23:19:16 +0000 (-0500)
Subject: inet: fix IP(V6)_RECVORIGDSTADDR for udp sockets
X-Git-Tag: v4.10-rc1~16^2~5
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=39b2dd765e0711e1efd1d1df089473a8dd93ad48;p=users%2Fdwmw2%2Flinux.git

inet: fix IP(V6)_RECVORIGDSTADDR for udp sockets

Socket cmsg IP(V6)_RECVORIGDSTADDR checks that port range lies within
the packet. For sockets that have transport headers pulled, transport
offset can be negative. Use signed comparison to avoid overflow.

Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
Reported-by: Nisar Jagabar <njagabar@cloudmark.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8b13881ed0644..976073417b03c 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -148,7 +148,7 @@ static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
 	const struct iphdr *iph = ip_hdr(skb);
 	__be16 *ports = (__be16 *)skb_transport_header(skb);
 
-	if (skb_transport_offset(skb) + 4 > skb->len)
+	if (skb_transport_offset(skb) + 4 > (int)skb->len)
 		return;
 
 	/* All current transport protocols have the port numbers in the
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 0489e19258ade..1407426bc862d 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -701,7 +701,7 @@ void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg,
 		struct sockaddr_in6 sin6;
 		__be16 *ports = (__be16 *) skb_transport_header(skb);
 
-		if (skb_transport_offset(skb) + 4 <= skb->len) {
+		if (skb_transport_offset(skb) + 4 <= (int)skb->len) {
 			/* All current transport protocols have the port numbers in the
 			 * first four bytes of the transport header and this function is
 			 * written with this assumption in mind.