Patch "geneve: avoid use-after-free of skb->data" has been added to the 4.8-stable tree

Patch "geneve: avoid use-after-free of skb->data" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    geneve: avoid use-after-free of skb->data

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     geneve-avoid-use-after-free-of-skb-data.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Dec  8 07:19:12 CET 2016
From: Sabrina Dubroca <sd@queasysnail.net>
Date: Fri, 2 Dec 2016 16:49:29 +0100
Subject: geneve: avoid use-after-free of skb->data

From: Sabrina Dubroca <sd@queasysnail.net>


[ Upstream commit 5b01014759991887b1e450c9def01e58c02ab81b ]

geneve{,6}_build_skb can end up doing a pskb_expand_head(), which
makes the ip_hdr(skb) reference we stashed earlier stale. Since it's
only needed as an argument to ip_tunnel_ecn_encap(), move this
directly in the function call.

Fixes: 08399efc6319 ("geneve: ensure ECN info is handled properly in all tx/rx paths")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/geneve.c |   14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -844,7 +844,6 @@ static netdev_tx_t geneve_xmit_skb(struc
 	struct geneve_dev *geneve = netdev_priv(dev);
 	struct geneve_sock *gs4 = geneve->sock4;
 	struct rtable *rt = NULL;
-	const struct iphdr *iip; /* interior IP header */
 	int err = -EINVAL;
 	struct flowi4 fl4;
 	__u8 tos, ttl;
@@ -871,8 +870,6 @@ static netdev_tx_t geneve_xmit_skb(struc
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	skb_reset_mac_header(skb);
 
-	iip = ip_hdr(skb);
-
 	if (info) {
 		const struct ip_tunnel_key *key = &info->key;
 		u8 *opts = NULL;
@@ -892,7 +889,7 @@ static netdev_tx_t geneve_xmit_skb(struc
 		if (unlikely(err))
 			goto tx_error;
 
-		tos = ip_tunnel_ecn_encap(key->tos, iip, skb);
+		tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 		ttl = key->ttl;
 		df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
 	} else {
@@ -901,7 +898,7 @@ static netdev_tx_t geneve_xmit_skb(struc
 		if (unlikely(err))
 			goto tx_error;
 
-		tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, iip, skb);
+		tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb);
 		ttl = geneve->ttl;
 		if (!ttl && IN_MULTICAST(ntohl(fl4.daddr)))
 			ttl = 1;
@@ -934,7 +931,6 @@ static netdev_tx_t geneve6_xmit_skb(stru
 	struct geneve_dev *geneve = netdev_priv(dev);
 	struct geneve_sock *gs6 = geneve->sock6;
 	struct dst_entry *dst = NULL;
-	const struct iphdr *iip; /* interior IP header */
 	int err = -EINVAL;
 	struct flowi6 fl6;
 	__u8 prio, ttl;
@@ -959,8 +955,6 @@ static netdev_tx_t geneve6_xmit_skb(stru
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	skb_reset_mac_header(skb);
 
-	iip = ip_hdr(skb);
-
 	if (info) {
 		const struct ip_tunnel_key *key = &info->key;
 		u8 *opts = NULL;
@@ -981,7 +975,7 @@ static netdev_tx_t geneve6_xmit_skb(stru
 		if (unlikely(err))
 			goto tx_error;
 
-		prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
+		prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
 		ttl = key->ttl;
 		label = info->key.label;
 	} else {
@@ -991,7 +985,7 @@ static netdev_tx_t geneve6_xmit_skb(stru
 			goto tx_error;
 
 		prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel),
-					   iip, skb);
+					   ip_hdr(skb), skb);
 		ttl = geneve->ttl;
 		if (!ttl && ipv6_addr_is_multicast(&fl6.daddr))
 			ttl = 1;


Patches currently in stable-queue which might be from sd@queasysnail.net are

queue-4.8/geneve-avoid-use-after-free-of-skb-data.patch
queue-4.8/rtnetlink-fix-fdb-size-computation.patch