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 4.4-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-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Dec 8 07:18:57 CET 2016
From: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Date: Fri, 2 Dec 2016 16:49:29 +0100
Subject: geneve: avoid use-after-free of skb->data
From: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxx>
Reviewed-by: John W. Linville <linville@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/geneve.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -815,7 +815,6 @@ 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;
@@ -842,8 +841,6 @@ 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;
@@ -859,7 +856,7 @@ static netdev_tx_t geneve_xmit_skb(struc
if (unlikely(err))
goto err;
- 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 {
@@ -869,7 +866,7 @@ static netdev_tx_t geneve_xmit_skb(struc
if (unlikely(err))
goto err;
- 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;
@@ -903,7 +900,6 @@ 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;
@@ -927,8 +923,6 @@ 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;
@@ -945,7 +939,7 @@ static netdev_tx_t geneve6_xmit_skb(stru
if (unlikely(err))
goto err;
- prio = ip_tunnel_ecn_encap(key->tos, iip, skb);
+ prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb);
ttl = key->ttl;
} else {
udp_csum = false;
@@ -954,7 +948,7 @@ static netdev_tx_t geneve6_xmit_skb(stru
if (unlikely(err))
goto err;
- prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, iip, skb);
+ prio = ip_tunnel_ecn_encap(fl6.flowi6_tos, 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@xxxxxxxxxxxxxxx are
queue-4.4/geneve-avoid-use-after-free-of-skb-data.patch
queue-4.4/rtnetlink-fix-fdb-size-computation.patch
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