From: Haishuang Yan Date: Thu, 25 Jul 2019 16:40:17 +0000 (+0800) Subject: ip6_tunnel: fix possible use-after-free on xmit X-Git-Tag: v4.9.189~10 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dfb98836f9a3feb4be8128521d1f4809814b092c;p=platform%2Fkernel%2Flinux-amlogic.git ip6_tunnel: fix possible use-after-free on xmit [ Upstream commit 01f5bffad555f8e22a61f4b1261fe09cf1b96994 ] ip4ip6/ip6ip6 tunnels run iptunnel_handle_offloads on xmit which can cause a possible use-after-free accessing iph/ipv6h pointer since the packet will be 'uncloned' running pskb_expand_head if it is a cloned gso skb. Fixes: 0e9a709560db ("ip6_tunnel, ip6_gre: fix setting of DSCP on encapsulated packets") Signed-off-by: Haishuang Yan Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index 42f363661d25..cc28b8646986 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -1275,11 +1275,11 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) fl6.flowi6_mark = skb->mark; } + dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); + if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) return -1; - dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph)); - skb_set_inner_ipproto(skb, IPPROTO_IPIP); err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, @@ -1362,11 +1362,11 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev) fl6.flowi6_mark = skb->mark; } + dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); + if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) return -1; - dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h)); - skb_set_inner_ipproto(skb, IPPROTO_IPV6); err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,