From 988dc4a9a3b66be75b30405a5494faf0dc7cffb6 Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi Date: Tue, 9 Apr 2019 11:47:20 +0200 Subject: net: fou: do not use guehdr after iptunnel_pull_offloads in gue_udp_recv gue tunnels run iptunnel_pull_offloads on received skbs. This can determine a possible use-after-free accessing guehdr pointer since the packet will be 'uncloned' running pskb_expand_head if it is a cloned gso skb (e.g if the packet has been sent though a veth device) Fixes: a09a4c8dd1ec ("tunnels: Remove encapsulation offloads on decap") Signed-off-by: Lorenzo Bianconi Signed-off-by: David S. Miller --- net/ipv4/fou.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'net/ipv4/fou.c') diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c index 79e98e21cdd7..12ce6c526d72 100644 --- a/net/ipv4/fou.c +++ b/net/ipv4/fou.c @@ -121,6 +121,7 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) struct guehdr *guehdr; void *data; u16 doffset = 0; + u8 proto_ctype; if (!fou) return 1; @@ -212,13 +213,14 @@ static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) if (unlikely(guehdr->control)) return gue_control_message(skb, guehdr); + proto_ctype = guehdr->proto_ctype; __skb_pull(skb, sizeof(struct udphdr) + hdrlen); skb_reset_transport_header(skb); if (iptunnel_pull_offloads(skb)) goto drop; - return -guehdr->proto_ctype; + return -proto_ctype; drop: kfree_skb(skb); -- cgit